Edible gardening — your questions answered

Levington Tomorite (4-3-8) is the UK standard and works for most British growers — it has the right K-heavy NPK ratio for fruiting tomatoes plus magnesium and seaweed extract. For very high yields under polytunnel cover, Chempak Soluble Tomato Food (11-9-30) provides more potassium. For organic allotment growers, comfrey tea (homemade, roughly 1-0-4) is the traditional British choice, supplemented with Maxicrop Original Seaweed. Stick with one product per season — consistency matters more than choosing the absolute 'best'.

From first flower onwards, every 7-10 days for greenhouse and growbag tomatoes, every 10-14 days for in-ground allotment plants. Start at half-rate for the first feed after transplant, then full-rate from week 4-5 onwards. Stop feeding 2 weeks before final harvest so the plant uses up its reserves and ripens existing fruit. UK growbag compost is generally pre-charged with 8-12 weeks of nutrient, so very early feeding right after transplant can scorch fresh roots — wait 3 weeks.

Yes. Tomorite is genuinely good — the NPK of 4-3-8 is the right K-heavy ratio for fruiting, the included magnesium prevents the yellow-between-veins interveinal chlorosis common in UK tomatoes, the seaweed extract feeds soil biology, and the dilution rate is forgiving (hard to over-apply). It dominates the UK market because it works, not just because of marketing. The only situation it underperforms is very high-yielding polytunnel growing in the final 6 weeks, when Chempak's higher K becomes meaningfully better.

Yes — comfrey tea is the UK allotment classic. Cut comfrey leaves (Symphytum officinale or 'Bocking 14'), pack into a bucket with a lid, weigh down with a stone, and leave for 4-6 weeks. The resulting liquid is roughly 1-0-4 NPK. Dilute 15:1 with water and apply weekly during fruiting. Nettle tea works similarly but with higher N — use early in the season then switch to comfrey at flowering. Worm castings from a wormery also work as a gentle slow-release supplement.

Stop feeding 2 weeks before your final harvest. For UK greenhouse tomatoes, that is typically mid-September depending on variety; for outdoor tomatoes, mid to late August in northern England and Scotland, early to mid September in southern England. The reason: in the final 2 weeks, the plant draws on accumulated reserves to fully ripen existing fruit. Continuing to feed at this stage encourages new flower set that will not ripen before the autumn cooldown, wasting the plant's energy.

A liquid feed applied every 7-10 days at full pack strength. Tomorite is the UK standard. Growbag compost has no microbiome to break down slow-release organic over time, so synthetic liquid feeds work better than granular slow-release. Start full-rate feeding from week 4 after transplant once the growbag's initial nutrient charge runs out. Add a weekly seaweed extract (Maxicrop) for trace minerals — the limited compost volume in a growbag is the most nutrient-restricted UK setup.

Tomorite or equivalent high-K liquid feed (Chempak Tomato Food, Westland Big Tom, Vitax Q4 Premium Tomato Feed) applied every 7 days from first flower at full pack rate. Greenhouse tomatoes have the highest yields and the most demanding feed schedule of any UK setup. For the final 4-6 weeks of high-yielding cropping, consider switching from Tomorite to Chempak Soluble Tomato Food (11-9-30) for the higher potassium. Add Epsom salts (1 tbsp per 4 L water) once a month if interveinal chlorosis appears.

Add your tomato variety, your UK growing setup (greenhouse, polytunnel, growbag, allotment, patio container), and your region to Growli. The app recommends a specific UK-stocked product (Tomorite, Chempak, Vitax Q4, Maxicrop, or a homemade option like comfrey tea), the dilution rate, and the application frequency tied to your local last-frost and flowering observations. Photograph any symptom and Growli diagnoses whether the issue is N excess, K deficiency, magnesium deficiency, or blossom end rot, and walks you through the fix.

Basil — by a wide margin. A 2024 study in Plant Cell Reports identified three basil volatile compounds (linalool, chavicol, alpha-terpineol) that prime tomato wound-defence genes. Caterpillars feeding on primed plants gained roughly half the weight of caterpillars on unprimed plants. West Virginia University intercropping trials separately recorded ~20% yield gains for tomatoes grown with basil at adequate density.

Partially. French marigolds (Tagetes patula) release alpha-terthienyl from their living roots, which kills root-knot nematodes when grown as a cover crop the season before tomatoes. UF/IFAS and Hawaii CTAHR document 40-50% nematode reduction. As a decorative border around an active vegetable bed, the effect is much smaller — and marigolds can actually increase populations of some other nematode species.

Alliums release sulfur compounds — primarily allicin — that suppress the Rhizobium leguminosarum bacteria living in legume root nodules. Those bacteria are what let beans and peas fix atmospheric nitrogen. Multiple extension trials show measurably reduced nodulation when beans grow within 2-3 rows of onions or garlic. Keep alliums and legumes on opposite sides of the garden.

Tomato + potato (both nightshades, share late blight Phytophthora infestans — 10+ feet apart or separate beds entirely). Brassicas next to tomato or pepper (heavy-feeder nutrient competition — 3+ feet apart). Alliums next to peas or beans (allicin suppresses nitrogen fixation). Fennel near almost anything (anethole allelopathy stunts growth within 3-4 feet).

Yes — it is the best-documented companion polyculture in horticulture. Corn provides a living trellis for beans; beans fix nitrogen for both corn and squash; squash leaves shade the soil and suppress weeds. A modern study found the Three Sisters delivered more total energy and protein per acre than any local monoculture. Individual crop yields are slightly lower than each grown alone, but the overall productivity of the bed is higher.

Not entirely. Companion planting reduces pest pressure (sometimes substantially) and nitrogen-fixing legumes provide free nitrogen for following crops. But heavy infestations still need physical removal, neem, or row covers, and most crops need supplemental phosphorus and potassium that legumes can't supply. Think of companion planting as a multiplier on good basics, not a replacement for them.

Yes — and the volatile-based mechanisms work even better in dense raised-bed plantings because the volatile cloud stays concentrated. For containers, pair only crops with the same water schedule (tomato + basil works; tomato + lavender doesn't), use a container at least 12 inches deep, and inoculate legume seeds with Rhizobium because container soil rarely has the bacteria naturally.

For allelopathic pairs (fennel, walnut, mature dill), 4+ feet usually clears the chemical effect. For heavy-feeder nutrient competition (tomato + cabbage), 3 feet of root separation or a different bed is enough. For shared-disease pairs (tomato + potato, with their shared late blight), 10+ feet or completely separate beds. For allium-legume interference (onion + bean), 2-3 rows of separation prevents the worst nodulation loss.

By crop, the minimums: tomato 20L (5 US gal), pepper 10L, cucumber bush 15L, zucchini 30L, strawberry 4L per plant, lettuce 4L, herbs 2-4L, full-size carrots 10-20L with 30cm depth. Bigger is always better — restricted roots limit yield. Dark pots in full sun should be light-coloured or double-potted to keep roots cool.

No — university Extension consensus advises against it. Garden soil compacts in containers, suffocating roots, and carries weed seeds, insects, and disease organisms. Use bagged soilless potting mix (peat or coir, perlite, vermiculite). If cost is a concern, blend 1 part garden soil with 1 part peat and 1 part perlite, but expect more variable results than bagged mix.

Daily in summer for most crops, twice daily for tomatoes and cucumbers in heat. Check by lifting small pots or sinking a finger 2 inches into larger ones. Water until it runs out the bottom, in the morning, and avoid wetting the leaves. Self-watering containers extend the gap to 2-4 days but need topping up.

Tomatoes (dwarf cultivars), peppers, strawberries, lettuce, herbs, spinach, kale, bush cucumbers, bush zucchini, radishes, Paris Market carrots, bush beans, and potatoes all thrive in containers. Skip sweet corn, pumpkins, winter squash, asparagus, and most large vining crops — they need ground bed space.

Fruiting crops (tomatoes, peppers, cucumbers, zucchini, strawberries) need at least 6 hours of direct sun. Leafy crops (lettuce, spinach, kale) tolerate 4-6 hours and benefit from afternoon shade in summer. Root crops (carrots, radishes) need 4-6 hours. If your space gets less than 4 hours, focus on herbs and salads only.

Yes for high-water crops in hot summers — tomatoes, peppers, cucumbers. They extend the gap between waterings to 2-4 days, provide more even moisture (reducing blossom end rot), and reduce water waste. Less essential for herbs and lettuce in cooler weather. The DIY version (two stacked buckets with a wick and fill tube) works as well as expensive commercial models.

Mix slow-release fertiliser into the potting mix at planting (most bagged mixes already include 2-3 months of feed). From flowering, liquid-feed weekly at half-strength — tomato fertiliser for fruiting crops, balanced for leafy. Top up with slow-release pellets mid-summer if leaves yellow. Always water first, then feed once soil is moist.

Add each container and crop to the Growli app. The app builds a per-pot watering schedule based on pot size, crop, and your local weather, plus feeding reminders timed to flowering. It also flags heatwaves coming so you can move pots into shade. Photograph any leaf symptom and Growli diagnoses common container problems (yellowing, salt buildup, root rot) with the fix.

Radishes, lettuce, bush beans, herbs (especially basil), cucumbers, and summer squash are the six easiest. All six germinate readily from seed, tolerate beginner mistakes, and reach harvest in 25-60 days. Radishes specifically top the list at 25-30 days from seed to plate — fastest of any common US home vegetable. The full ranked 12 are above with time-to-harvest for each.

Radishes are the single easiest vegetable to grow in a US home garden. Direct-sow seeds, thin once, water consistently, and harvest in 25-30 days. They tolerate cool weather, imperfect soil, and beginner watering. Lettuce is a close runner-up for slightly longer harvest (30-45 days) and a longer eating window from cut-and-come-again varieties.

Radishes — 25-30 days from seed to harvest, no transplanting, no trellis, no special soil. Direct-sow seeds half an inch deep, thin to 1-2 inch spacing once seedlings emerge, water every few days, and pull when the visible root is the size of a quarter. They tolerate spring and fall conditions across most USDA zones.

Radishes are the consensus answer among master gardeners and university extensions — fastest from seed to plate (25-30 days), most forgiving of beginner mistakes, and tolerant of cool weather. If you don't like radishes, lettuce is the next easiest at 30-45 days. Bush beans and basil are the easiest warm-weather crops that aren't roots or greens.

The six easiest US home vegetables are radishes (25-30 days), lettuce (30-45 days), bush beans (50-60 days), basil and other herbs (30-60 days), cucumbers (50-70 days), and summer squash (50-60 days). Pick three from this six for a beginner garden — together they give you fast wins from radishes, salad greens from lettuce, and bulk yield from squash and beans.

For most US first-time gardeners we recommend starting with radishes, lettuce, bush beans, basil, and cherry tomatoes (from a transplant). Radishes and lettuce give you fast cool-weather wins; beans and basil produce reliably through summer; cherry tomatoes are the most forgiving warm-season transplant. Add cucumbers or zucchini in year 2 if you want higher bulk yield.

Easiest vegetables: radishes, lettuce, beans, herbs, cucumbers, summer squash. Easiest fruits: strawberries (in zones 4-9, perennial), raspberries (in zones 3-8, perennial), and cherry tomatoes (annually, treated as a vegetable). Avoid blueberries, peaches, and apples in a first garden — they want specific soil pH or take years to fruit. Stick with strawberries and raspberries for early fruit wins.

Radishes, lettuce, bush beans, basil, cucumbers, summer squash, kale, and Swiss chard are the easiest US garden vegetables. All eight tolerate beginner watering, don't need staking, and produce reliably in spring through fall in zones 5-9. Tomatoes and peppers are slightly fussier and reward more patience — graduate to those once you've succeeded with three from the easy list.

At home (raised bed, container, or in-ground), radishes and lettuce are the easiest because they tolerate small spaces and shallow soil. Herbs in containers on a sunny windowsill are even easier — basil, chives, and parsley in 6-inch pots produce all summer with almost no effort. For a single home gardening win this week, plant a 4-inch pot of basil from a nursery and harvest leaves within two weeks.

Beginner-friendly vegetables share three traits — fast time-to-harvest, forgiving of inconsistent watering, and high yield per square foot. The clear top 5 are radishes, lettuce, bush beans, basil, and cherry tomatoes. Plant all five together in a 4x4 foot raised bed and you'll harvest something every week from late spring through frost. Skip corn, melons, and cauliflower for year 1.

The best vegetables to grow at home are the ones you actually eat that are also expensive or hard to find fresh — cherry tomatoes, salad greens, basil and other herbs, snap peas, and bush beans. These give you the highest value per square foot and the fastest payback. Radishes and zucchini are the easiest, but only worth growing if you'll cook with them.

Good beginner vegetables are fast, forgiving, and don't need transplants or staking. Radishes, lettuce, bush beans, basil, and Swiss chard are the top picks for a first-year garden. Cherry tomatoes and zucchini are slightly more work but produce dramatically more — add them once you've succeeded with two or three from the easy list.

Count backward from your average first hard frost. For each crop: first frost date minus (days to maturity + about 14 days fall factor + roughly 10 days harvest window) = sow or transplant date. In practice that means roughly July in cold zones (3-4), late July to August in zones 5-6, August to September in zones 7-8, and October to November in zones 9 and warmer. The planning has to happen in June or July, not September.

The fall factor is an added buffer of roughly 14 days (or about 10 to 14 percent of the crop's days to maturity) that you add when counting back from first frost. Seed-packet days-to-maturity figures were measured under lengthening, warming spring days. In autumn, days shorten and cool, so crops grow more slowly than that figure suggests. Without the fall factor, crops are not ready when frost arrives. Cooperative Extension fall-gardening guides consistently recommend this adjustment.

Cool-season crops: spinach, lettuce, kale, Asian greens, chard, collards, broccoli, cabbage, cauliflower, Brussels sprouts, kohlrabi, turnips, radish, beets, and carrots. Many of these — kale, carrots, Brussels sprouts, parsnips — taste noticeably better after light frost because cold converts stored starch to sugar. Garlic is also planted in autumn, but it is harvested the following summer rather than in fall.

Yes, but the window is tight and you must lean on fast crops and transplants. Sow radish, spinach, leaf lettuce, and Asian greens (30 to 50 days) by July, transplant six-week-old brassica starts rather than direct-sowing them, and have floating row cover on the bed from the start to push the harvest a few extra weeks. A cold frame or low tunnel extends a cold-zone fall garden by one to two more weeks.

Floating row cover or horticultural fleece gives 4 to 8°F of protection per layer and is the cheapest option — lay it directly over crops or on hoops. Low tunnels (fleece or clear plastic over hoops) gain roughly one zone of cold tolerance. Cold frames shift the effective microclimate by around 1.5 zones. Stage the hoops and covers beside the bed in September so you can cover within ten minutes when the first frost is forecast — do not wait.

Light frost improves many of them. Kale, carrots, Brussels sprouts, parsnips, leeks, and collards convert starch to sugar under cold and taste sweeter after a frost or two. What you protect against is the first hard or killing freeze, and tender crops like lettuce and cauliflower that are less frost-hardy. Plan your harvest to take advantage of the sweetening frosts rather than racing to beat the first light touch of cold.

They overlap. Succession planting is the broad technique of staggered sowings for continuous harvest across a season; a fall garden is specifically the autumn cool-season crop, often planted by relay succession into beds vacated by finished summer crops. In practice, the fall garden is the second half of a year-round succession plan — see the succession planting guide for the full-season framework.

Add your location and Growli calculates each crop's fall sow or transplant date from your local first-frost average, applying the days-to-maturity plus fall-factor arithmetic automatically — so the critical June and July planning window does not slip past you. Growli flags which slow crops need to be started indoors and transplanted, schedules frost-protection reminders, and tells you which beds are coming free for relay planting as summer crops finish.

Four steps. (1) Remove perennial weeds — bindweed, ground elder, dock, couch grass — by hand. (2) Test pH with a meter or lab; most vegetables want 6.0 to 7.0. (3) Test texture by squeezing a moist handful: crumbly is sandy, ribbons but cracks is loam, smooth bendy ribbon is clay. (4) Apply 5 to 8 cm of well-rotted compost or leaf mould as a top mulch (no-dig) or dig it in once (traditional). Lime to raise pH or sulphur to lower it, if needed. Wait 2 weeks before planting.

Developed by Charles Dowding, the no-dig method has two rules: never dig, rototill, or invert soil; and feed soil life from the surface by applying compost as an annual top mulch. To start: lay one layer of plain cardboard over weeds, apply 5 cm of finished compost (7 to 12 cm over weedy ground), firm with your feet, plant directly into the compost. Top up with 2 to 5 cm of compost each subsequent year. Works because mycorrhizal fungi, soil structure, and the dormant weed-seed bank are all preserved.

Most vegetables want soil pH between 6.0 and 7.0 — slightly acidic. Brassicas (cabbage, broccoli, kale, Brussels sprouts) prefer 6.5 to 7.5 because the higher pH suppresses club root disease. Blueberries are a strong exception at 4.5 to 5.5. Asparagus tolerates 6.5 to 7.5. Use a digital pH meter (about 20 USD or 20 GBP) for a quick reading or send a sample to a Cooperative Extension lab (US) or the RHS Soil Analysis Service (UK) for a definitive number.

No. Annual rototilling destroys soil aggregates, kills mycorrhizal networks, creates a hardpan just below the tilled depth, and brings dormant weed seeds to the surface. The modern consensus across home gardening and market gardening is the no-dig approach: apply 2 to 5 cm of compost as a top mulch each year and let earthworms incorporate it. The exception is a one-off initial dig or broadfork pass to break severe compaction or remove deep perennial weeds.

The only durable fix for clay is repeated annual additions of organic matter — compost, leaf mould, well-rotted manure — applied as a top mulch (no-dig) or dug in once. Do not add sand — it combines with clay particles to create a concrete-like layer. Plant cover crops over winter to keep roots in the soil. Avoid walking on wet clay (it compacts catastrophically). Within 2 to 5 years a heavy clay can develop genuine workable structure with this approach.

A cover crop (also called green manure) is a plant grown to protect and build soil rather than for harvest. Use one in any bed that will sit empty for 6+ weeks — especially over winter. Crimson clover and winter field beans fix nitrogen for next year's crops; cereal rye builds biomass and suppresses weeds; mustard biofumigates against soil pests; phacelia feeds pollinators. Terminate by chopping at the base 2 to 4 weeks before planting the next crop, leaving cut tops on the soil as mulch.

US: every state's Cooperative Extension service offers low-cost soil testing through the land-grant university — typically 10 to 25 USD for a standard pH, organic matter, and NPK report. UK: the RHS Soil Analysis Service at Wisley charges about 35 GBP per sample for a full test, or less for pH only. For heavy-metal screening (lead, arsenic, urban contamination) use a commercial lab like NRM Laboratories (UK) or your state Extension's advanced test (US, typically 40 to 80 USD).

Add your garden location to Growli and the app estimates likely soil pH and texture from your postcode geology (UK) or zip-code soil map (US). Photograph a moist handful of your soil and Growli's image model classifies it as clay, loam, sand, or silt. The app then recommends amendments — lime quantity, compost depth, suitable cover crops — for the crops you plan to grow. Logging amendments builds a multi-year soil history Growli uses to refine future suggestions.

From seed: 5-10 days to germinate, 4-6 weeks to first harvest, 8-12 weeks to a full bushy plant. From transplant: first harvest in 2-3 weeks, full plant in 6-8 weeks. Outdoor basil hits peak production in July-August in US and UK climates.

Use the brightest spot you have — south-facing window with at least 6 hours of direct sun, or a grow light for 12-14 hours daily. Water when the top inch is dry, feed lightly every 2-3 weeks, and pinch above leaf nodes every 2-3 weeks to keep bushy. Indoor basil usually lasts 3-4 months before becoming leggy.

Surface-sow seeds in moist seed-starting mix and cover with a thin layer of vermiculite. Basil needs light to germinate well. Keep soil at 18-24°C (65-75°F) and germination happens in 5-10 days. Pot up to 4-inch containers when the first true leaves appear; transplant outdoors after the last frost.

Repot into a 5-inch container with fresh potting mix immediately — store basil is usually crammed into tiny pots that exhaust nutrients in days. Place in full sun, water when the top inch is dry, and pinch above nodes weekly to encourage branching. A well-managed transplant outproduces a seed-grown plant for the first 2 months.

The honest answer: it's hard. Basil needs 12+ hours of bright light and warm temperatures. In winter, even south-facing windows in the US northeast and UK midlands don't provide enough light. Use a grow light, restart from cuttings every 3-4 months, and accept that summer harvests will be stronger than winter ones.

Use a 5-inch container minimum (10-inch ideal) with drainage. Fill with quality potting mix. Place in 6+ hours direct sun. Water daily in summer, every 2-3 days otherwise. Feed at quarter-strength every 2 weeks. Pinch above nodes every 2-3 weeks. One large pot supports 1-2 plants well — don't overcrowd.

Always harvest by pinching whole stems above a node, not by picking individual leaves. Each pinched stem causes the plant to branch from the node below, doubling leaf production. Aim to remove the top 30-40% of growth at each harvest, every 2-3 weeks during active growing season.

Add your basil to Growli and the app sets pinching reminders every 2-3 weeks, watering reminders calibrated to your local weather, and frost warnings so you can bring container basil indoors before damage. Photograph any disease symptoms and Growli walks you through diagnosis and recovery.

Sow seeds indoors in late March, on a heated propagator or warm windowsill at 18°C+. Plant out in late May (south of England) to early June (Scotland and Northern England). Outdoor planting only works in a sheltered, sunny, south-facing position. The brightest south-facing kitchen windowsill is the most reliable UK basil home from May to September.

From seed: 5-10 days to germinate, 4-6 weeks to first harvest, 8-12 weeks to a full bushy plant. From a supermarket pot (split into clumps): first harvest in 2 weeks. From a garden centre transplant: first harvest in 2-3 weeks. UK basil hits peak production in July-August on a sunny windowsill or in a greenhouse.

Use the brightest spot you have — south-facing windowsill with at least 6 hours of direct sun, or a grow light for 12-14 hours daily. Water when the top 2-3 cm is dry, feed lightly every 2-3 weeks May-September, and pinch above leaf nodes every 2-3 weeks to keep bushy. Indoor basil in UK winter (November-February) usually struggles without a grow light — plan for 3-4 months of life before restarting.

Tip the pot out and gently divide the root ball into 4-6 clumps of 3-5 plants each. Plant each clump into a 12-15 cm pot of fresh peat-free multipurpose compost. Water in and keep on the sunniest windowsill. The crammed supermarket pot exhausts itself in days; split plants thrive for months and outproduce seed-grown basil for the first 6-8 weeks.

Surface-sow seeds in moist seed-starting compost and cover with a thin layer of vermiculite. Basil needs light to germinate well. Keep compost at 18-24°C using a heated propagator or warm radiator. Germination happens in 5-10 days. Pot up to 9-10 cm containers when the first true leaves appear; transplant outdoors only after late May once nights stay above 10°C.

The two most common causes: downy mildew (black spots, leaves collapse fast — a major UK problem in wet summers) or cold-snap damage (overnight temperature drops below 10°C). For downy mildew, remove affected leaves, improve air flow, water at the base only, and switch to resistant cultivars (Prospera, Eleonora). For cold damage, move plants indoors and wait — basil under 10°C halts growth and often dies.

Always harvest by pinching whole stems above a node, not by picking individual leaves. Each pinched stem causes the plant to branch from the node below, doubling leaf production. Aim to remove the top 30-40% of growth at each harvest, every 2-3 weeks during active UK growing season (May-September).

Sweet Genovese is the all-rounder. Lemon basil and Thai basil are easy and add flavour variety. For downy mildew resistance — increasingly important in UK summers — try Prospera Compact or Eleonora. Greek basil (small-leaved) is bushy and decorative on a windowsill. UK seed suppliers: Suttons, Thompson & Morgan, Mr Fothergill's, D.T. Brown.

Add your basil to Growli and the app sets pinching reminders every 2-3 weeks, watering reminders calibrated to your UK postcode weather, and frost warnings so you can bring container basil indoors before damage. Photograph any disease symptoms and Growli walks you through diagnosis and recovery — especially helpful for spotting downy mildew early.

In the US, Apache (erect, large fruit), Triple Crown (semi-erect, most productive), and Natchez (early thornless) are top choices. In the UK, Loch Ness is the standard — bred in Scotland, semi-erect, heavy yields, excellent flavour. Oregon Thornless is a popular trailing option with attractive cut-leaf foliage.

It depends on type. Floricane varieties (most): cut the fruited canes to the ground right after harvest in July-August, keep this year's new green canes for next year, then tip-prune those in February to 30-45 cm. Primocane varieties (Prime-Ark Freedom, Prime-Ark Traveler): cut every cane to the ground in late winter.

Erect varieties: 1.0-1.2 m (3-4 ft) apart in a row. Semi-erect varieties like Triple Crown: 1.8-2.5 m (6-8 ft) apart. Trailing varieties: 2.5-3 m (8-10 ft) apart. Row spacing 2.5-3 m (8-10 ft) between rows for access. Going too close causes fungal disease and tangled canes.

Erect varieties (Apache, Navaho) get away with a simple two-wire fence at 1.0 m and 1.5 m heights. Semi-erect (Triple Crown, Loch Ness) and trailing varieties need a T-trellis: 2.4 m posts with a 0.6 m cross-bar at the top, two horizontal wires either side at the top and middle. The trellis separates this year's canes from next year's fruiting canes.

Floricane varieties fruit from mid-July to early September in most UK and US climates, with peak in August. Primocane varieties (Prime-Ark) fruit later, from August into October, with the crop coming on this year's growth. First crops appear in year two from planting.

Mainly the core. When you pick a ripe raspberry, the receptacle stays on the plant and the berry is hollow. When you pick a ripe blackberry, the receptacle comes away inside the berry (solid core). Blackberries also grow more vigorously, have longer canes, and many cultivars are thornless — fewer raspberries are.

Yes — choose an erect thornless variety like Apache or Navaho, which stays around 1.5-2 m tall on simple two-wire support. One plant occupies about 1 m of fence line and produces 4-7 kg of fruit at maturity. Semi-erect and trailing types need significantly more space.

Add your variety and Growli identifies whether it's floricane or primocane-fruiting and sets the right pruning reminders — post-harvest cuts for floricane types, late-winter cuts for primocane types. Photograph leaves or canes for orange rust, anthracnose, or cane borer diagnosis with treatment steps.

Blueberries need acidic soil with a pH between 4.0 and 5.0, with 4.5 as the sweet spot. Above pH 5.5 they develop iron chlorosis (yellow leaves) and slowly decline. Test your soil before planting and lower the pH with elemental sulphur (6-12 months before planting) or grow in raised beds filled with ericaceous compost.

Most blueberries are technically self-fertile, but they crop much better with a pollination partner. Plant two different cultivars with overlapping flowering times — Bluecrop with Patriot, or Bluecrop with Brigitta — and you'll get significantly larger berries and heavier yields. The two bushes should be within 3 m (10 ft) of each other.

Most highbush blueberries start producing small crops in year 2 (1-2 lb per bush) and reach full production by year 4-5 (3-5 kg per bush). They keep cropping for 30+ years with annual pruning. Buying 2-3 year old bushes from a nursery shortens the wait by a year or two.

Yes — blueberries are one of the best fruits for container growing, especially if your garden soil is alkaline. Use a 40-50 litre (10-12 gallon) pot, fill with ericaceous compost, water with rainwater where possible, and top-dress with fresh ericaceous compost each spring. Compact varieties like Sunshine Blue and Top Hat are bred specifically for pots.

Yellow leaves with green veins (interveinal chlorosis) is the classic sign of high soil pH. Iron and manganese become locked up above pH 5.5. Re-test the soil, top up with elemental sulphur, switch to rainwater for irrigation, and apply a chelated iron foliar feed as a short-term fix while the sulphur acts on the soil.

Prune in late winter while bushes are dormant — January to early March in most US climates and February in the UK. Don't prune in years 1 and 2. From year 3, remove dead and crossing wood, take out the oldest 2-3 canes at the base, and thin congested centres for airflow. Aim for 8-12 main canes of mixed ages on a mature bush.

For US zones 3-4: Northland (half-high, bred at Michigan State), Patriot, Polaris, and Chippewa. These half-high types tolerate -30°F (-34°C) winters. In the UK, all main highbush cultivars survive normal winters; choose Bluecrop or Patriot for the most reliable cropping in cooler northern gardens.

Add your cultivars and the soil pH from your latest test to Growli. The app schedules sulphur top-ups, ericaceous feed windows, mulch refreshes, and the spring pruning window. Photograph yellowing leaves and Growli identifies whether it's pH drift, iron deficiency, or another issue and walks you through the fix.

Most cultivars are ready 60-80 days from sowing. Paris Market (round) is the fastest at 50-60 days. Imperator types (long) take 70-80 days. Carrots can stay in the ground beyond maturity — they sweeten with cold and store well in mild winters under mulch.

Almost always a soil problem. Stones in the top 12 inches make the root fork around them. Heavy clay produces stubby, twisted roots. Fresh manure or high-nitrogen fertiliser produces hairy forked roots. Fix by sifting stones from the top of the bed, raising the bed if clay is heavy, and using only old compost (no fresh manure).

Chantenay types are the best clay-tolerant carrots — short, broad-shouldered 5-6 inch roots that tolerate heavier soil as long as organic matter is high. Paris Market (round, 1.5 inch) is the most clay-forgiving but only gives small roots. For deep slender Imperator-type carrots, you need sandy loam — heavy clay won't work without raised beds.

Carrots grown too close to each other compete for space and stay stubby and forked. Thin in two passes — first to 1 inch apart at 2-true-leaf stage, then to 2-3 inches at 6 weeks. Crowding is the second most common cause of poor carrot harvests after rocky soil. Thin in the evening and remove thinnings to avoid attracting carrot fly.

Cover the bed with fine insect-proof mesh or horticultural fleece from the moment of sowing — secured at the edges so the fly can't get under. A 60 cm vertical mesh wall also works because carrot flies fly low. Combine with resistant cultivars (Flyaway F1, Resistafly F1) for the best protection. Interplanted onions reduce attack rates 30-50% but aren't enough on their own.

Yes — but match the pot depth to the cultivar. Paris Market (round, 1.5 inch) grows in 15 cm pots. Nantes types need 30 cm depth. Imperator types need 40 cm. Use a sandy potting mix (regular potting compost mixed 50:50 with horticultural sand) and keep the surface moist for the slow germination.

60-80 days after sowing for most cultivars, when foliage is 12 inches tall and shoulders show orange at soil level. Pull a sample weekly after week 8 to gauge size and sweetness. Carrots can stay in the ground after the first frost and sweeten — in mild winters, mulch heavily and pull fresh through winter.

Add your carrot cultivar and zone to the Growli app. The app sends sowing alerts tied to soil temperature, thinning reminders, and a heads-up before carrot fly flight periods in the UK so you can fit mesh in time. Photograph any pest or disorder and Growli diagnoses common carrot problems (forking, carrot fly damage, splitting) with the fix.

Germination in 7-14 days at 18-22°C. First light harvest at 75-90 days from sowing; a full mature clump at 4-5 months. From a transplant or division, expect a first harvest in 4-6 weeks.

Common chives (Allium schoenoprasum) have hollow round leaves, pink pom-pom flowers, and a mild onion flavour. Garlic chives (Allium tuberosum) have flat strap-like leaves, white star-cluster flowers, and a milder garlic flavour. Both are perennial in zones 3-9. Garlic chives self-seed aggressively and need deadheading.

Cut outer leaves about 1 inch above the soil with sharp scissors, taking roughly a third of the clump every 2-3 weeks. Never just snip the tips of individual leaves — those stop growing from the cut point. Frequent cutting actually improves production by signalling new growth from the bulb.

Yes — chive flowers are edible and have a milder version of the leaf flavour. Pull the florets apart and scatter on salads, omelettes, or soft cheese. Chive flowers also infuse white wine vinegar with a pink colour and onion-floral note. Flowering does slow leaf production, so deadhead if maximum leaf yield is the goal.

Yes — chives are one of the easier herbs to grow on a kitchen windowsill. Use a 6-inch pot, place on a south-facing windowsill, water when the top inch is dry, and harvest by cutting outer leaves at the base. Indoor chives benefit from being moved outside in summer to recover vigour.

No. Chives are TOXIC to dogs, cats, and horses. The ASPCA classifies common chives as toxic due to N-propyl disulfide, which causes hemolytic anaemia (red blood cell destruction) and Heinz body formation. Cats and Japanese dog breeds are particularly susceptible. Site chives away from pets, never feed trimmings to animals, and call the ASPCA Poison Control hotline at (888) 426-4435 immediately if a pet ingests any.

Yes — chives are a hardy perennial in USDA zones 3-9 and across the UK. The plant dies back to the bulb after first frost and resprouts vigorously in early spring. Divide established clumps every 3-4 years in early spring to refresh vigour and prevent the centre of the clump producing thinner leaves.

Add chives to Growli and the app schedules harvest reminders every 2-3 weeks tied to your local growing season, sets deadheading alerts before garlic chives self-seed, and reminds you to divide clumps every 3-4 years. For pet households, Growli flags chives as toxic and suggests fenced or raised-bed siting away from pet zones.

Most cultivars produce ripe fruit in 55-65 days from direct-sown seed. Bush varieties (Spacemaster 80, Bush Crop) are fastest at around 55 days. Vining cultivars (Marketmore 76, Straight Eight) take 60-65 days. Greenhouse parthenocarpic types like Carmen F1 take 60-70 days from a transplant into warm conditions.

A healthy outdoor vining cucumber plant produces 10-20 fruits over a 6-week harvest window. Bush types yield 6-10 fruit. Greenhouse parthenocarpic cucumbers can yield 25+ fruit if kept picked, fed, and free of mildew. For a family of four, 2-3 plants is plenty.

The main cause is inconsistent watering — dry spells followed by deep watering trigger the bitter compound cucurbitacin in the fruit. Other causes: cool nights below 12°C/55°F, very hot days over 35°C/95°F, and old or stressed plants. Fix by mulching heavily and watering deeply at the base 1-2 times per week.

Use a 20-30 litre (5-8 US gallon) pot per plant, filled with quality potting mix (not garden soil). Choose a bush cultivar like Spacemaster 80 or Bush Champion, or a compact greenhouse type like Carmen F1. Water daily in summer, feed weekly with diluted balanced fertiliser, and add a small trellis or stake for support.

Yes — cucumbers need at least 6 hours of direct sun, ideally 8+ in cool UK summers. Plants in shade produce leafy growth but few flowers and small misshapen fruit. The only exception is mid-summer afternoon shade in very hot US zones (zone 9-10), which can reduce heat stress.

Deep watering 1-2 times per week in mild weather, providing 1-2 inches of water per session. In heat over 30°C/86°F, daily watering is needed. Container plants always need daily watering in summer. Mulch heavily with straw or grass clippings to stabilise soil moisture and prevent the wide swings that cause bitter fruit.

Vining greenhouse cucumbers benefit from removing side shoots up to the first 5-6 flower trusses and topping the main stem at the greenhouse roof. Outdoor vining and bush cucumbers don't need pruning — just remove yellow or mildewed leaves to improve airflow. Always remove male flowers from parthenocarpic varieties if any appear.

Add your cucumber variety and location to the Growli app. The app builds a season calendar tied to your last frost date — sowing reminders, transplant timing, trellis prompts, and side-dressing schedules. Photograph any leaf symptom and Growli diagnoses common cucumber problems (powdery mildew, spider mites, whitefly) with the specific treatment plan.

Chicago Hardy is the gold standard for US zones 5-7, surviving -20°F (-29°C) at root level. Brown Turkey is the most reliable for both UK gardens and US zones 6-10. Celeste produces small ultra-sweet fruit that ripens early — important in short-season zone 6 climates. All three are common figs, parthenocarpic, and need no pollinator.

No — common figs (Ficus carica), which include every backyard cultivar like Chicago Hardy, Brown Turkey, Celeste, and Brunswick, are parthenocarpic and self-fertile. They produce fruit without pollination. The fig wasps people sometimes worry about only pollinate Smyrna and Caprifig types, which are not grown in temperate home gardens.

In USDA zones 5-6, wrap the tree in horticultural fleece after leaf-fall, add a layer of dry leaves or straw, and cover with a waterproof tarp at the top only (sides need airflow). For container trees, move the pot to an unheated greenhouse, garage, or polytunnel once temperatures drop below -5°C / 23°F. In most of the UK, light fleece wrapping during cold snaps and a deep mulch over the roots is enough.

Almost always one of three reasons: roots are growing unrestricted in rich soil (push lush vegetative growth at the expense of fruit), excess nitrogen feeding, or insufficient sun. Restrict the roots with a paving-slab-lined pit or a large container, stop high-nitrogen feeding, and prune to open the canopy for sun penetration. Young trees may also take 3-5 years before reliable fruiting.

Main pruning is in late winter (February in UK; January-February in US) when the tree is dormant. Remove dead, damaged, and crossing wood, shorten this year's strong new shoots by a third, but leave the tips of last year's wood intact — those tips carry the breba crop. Summer pinching of new shoots to 5-6 leaves in June-July concentrates fruit production.

Use a 40-60 litre (10-15 gallon) pot, fill with loam-based potting mix plus added grit, water consistently in summer, and feed with a high-potassium liquid every 2-3 weeks during fruit development. Top-dress annually with fresh compost in spring. Move the pot into a frost-free shed, garage, or greenhouse over winter. Container growth naturally restricts roots — perfect for figs.

The main crop ripens from late August through October in most US zones 6-7 and UK gardens, depending on summer warmth. A breba crop (on last year's wood) can ripen as early as June-July in warm climates but often fails to ripen in cool UK summers. Ripe figs hang down, feel soft, crack slightly at the eye, and pull off easily — they do not ripen after picking.

Add your variety and location to Growli and the app schedules winter wrap reminders by frost forecast, breba vs main crop pruning windows in late winter, summer shoot-pinching dates, and harvest watch from late August. Photograph any leaf or fruit symptom and Growli diagnoses whether it's fig drop, scale, coral spot, or another issue.

Buy certified seed garlic, split it into cloves on planting day, and plant the largest cloves pointed end up — 2 inches deep in mild zones, 4 inches in cold zones, 6 inches apart — in fall in full sun and free-draining soil. Mulch after the first hard frost. Feed with nitrogen in early spring, keep the bed weed-free, snap scapes off hardneck types in early summer, stop watering 2 weeks before harvest, then lift when the lower leaves brown and cure for 3-4 weeks.

Hardneck garlic needs a cold winter, produces an edible scape, has larger easy-peel cloves and stronger flavour, and stores 4-6 months — best for US zones 3-7 and most of the UK. Softneck garlic tolerates milder winters, has no scape, more and smaller cloves, milder flavour, stores 8-12 months, and can be braided — best for US zones 7-11 and southern UK. In the overlap, grow both.

Garlic needs roughly 6-8 weeks below 40°F (4°C) to trigger a single clove to differentiate into a segmented bulb. Without that cold, the plant grows leaves but never divides and you harvest a single round instead of a head of cloves. This is why garlic is planted in fall for natural winter cold; in warm zones, cloves are pre-chilled in the fridge for 6-8 weeks before a late-winter planting.

Yes, on hardneck garlic. Snap or cut the scape off once it has curled one full loop, about 3-4 weeks before bulb harvest. Removing it redirects energy into the bulb and can increase bulb size by up to about 25%. The scapes are edible and delicious sautéed or made into pesto. Softneck garlic does not produce scapes.

Harvest when the lower 3-4 leaves have browned and dried but the upper 5-6 leaves are still green — each green leaf is a wrapper layer protecting the bulb. That is typically late June to mid-July in US zones 5-7 and across the UK. Stop watering 2 weeks before harvest, then lift gently with a fork rather than pulling by the stem.

Cure harvested garlic for 3-4 weeks somewhere dark, dry, and airy, hung in bunches or laid on racks. It is ready when the neck is tight and the wrappers are papery. Trim roots and stems (or braid softneck), then store at 50-60°F somewhere cool, dark, and dry. Don't refrigerate it — cold makes garlic sprout. Hardneck keeps 4-6 months, softneck 8-12 months.

Yes — strongly. The ASPCA lists all alliums including garlic as toxic to dogs and cats. Garlic is about 3-5 times more toxic than onion, and the thiosulfate compounds cause Heinz-body hemolytic anaemia by destroying red blood cells. Cats are most susceptible. Signs (weakness, pale gums, dark urine, collapse) can take days to appear. Keep cloves, scapes, and trimmings away from pets and call ASPCA Poison Control at (888) 426-4435 if ingested.

It is not recommended. Supermarket garlic is often treated with sprout inhibitors, may carry disease, and is usually a variety bred for storage in a different climate than yours. Buy certified seed garlic from a nursery or specialist grower — it is disease-screened and climate-matched, and you can save your biggest home-grown bulbs as next year's seed.

Add your zip code or postcode to Growli and it times the full nine-month sequence to your local frost date — when to source seed garlic, your exact planting week, when to mulch, the spring nitrogen feed window, the early-summer scape snap, the stop-watering date, and the brown-leaf harvest signal. Photograph leaf problems and Growli flags allium issues like rust or rot.

In the UK, Phoenix (white, mildew-resistant), Boskoop Glory (black, RHS AGM), Solaris (early white wine), and Rondo (black wine) are the proven outdoor performers. In US zones 5-7, Concord and Niagara remain the most reliable table grapes; Reliance is a top pink seedless. Cool-climate vinifera wine grapes need a south-facing wall or south-facing slope.

Plant bare-root vines during dormancy — November to March in the UK, late autumn or early spring in the US after the ground thaws. Container-grown vines go in any frost-free month, with spring rooting best. Use our frost-date calculator to find the safe window for your location.

Prune in deep dormancy (December-February) when the vine is fully leafless. On a cordon system, cut last year's fruited canes back to 2-bud spurs (5-7 cm stubs) on the permanent horizontal arm. Each spur produces 2 new canes that will fruit the next season. Don't prune late when buds are swelling — vines bleed sap heavily.

First small crops appear in year 2 if growth is strong, with full production from year 3-4 onwards. A mature cordon-trained vine produces 3-8 kg per season; a Geneva double curtain system or vigorous American grape can hit 12-20 kg. Vines remain productive for 30+ years with annual pruning.

Grapes prefer slightly acidic to neutral soil, pH 6.0-6.8. They actively dislike rich, wet ground and crop better on well-drained sandy or gravelly soils. Don't dig heavy manure into the planting hole — high fertility pushes leafy growth at the expense of fruit. Test your soil before planting using our soil pH guide.

Choose mildew-resistant cultivars first — Phoenix, Solaris, Rondo, and Thomcord avoid most of the spray season. Improve airflow with summer leaf-thinning, water at the base only, and apply sulphur fungicide preventatively from early summer through veraison. See our powdery mildew guide for the full diagnostic and treatment routine.

Yes — grapes are climbing vines that need permanent horizontal support. The three main systems are cordon (a permanent arm at 90 cm with three wires), espalier on a wall (best for UK marginal climates), and Geneva double curtain (high-yielding twin canopy for vigorous American grapes). All three require sturdy posts and tensioned 2.5-3 mm wire.

Add your cultivar and trellis type to Growli and the app builds the year-round calendar — winter spur pruning, summer shoot tipping, leaf thinning at veraison, powdery mildew watch, and the brix harvest test. Photograph any leaf or berry symptom and Growli diagnoses whether it's powdery mildew, downy mildew, or other issues.

Wait until the last frost has passed and soil reaches at least 60°F, then direct-sow seed 1 inch deep in full sun. Choose bush beans (no support, quick crop) for your first try. Keep soil evenly moist through flowering and pod set, mulch to hold moisture, skip nitrogen fertiliser (beans make their own), and pick pods young every 2-3 days to keep the plant producing.

Bush beans are compact, 1-2 feet tall, need no support, and crop heavily over a concentrated 2-3 week window — ideal for small spaces and freezing a batch. Pole beans are climbing vines 6-15 feet tall that need a trellis or poles, start a few days later, but then produce for months from a single sowing. Set pole supports up before sowing.

Beans need soil at 4 inches deep to be at least 60°F (16°C) before they germinate reliably, with 65-85°F ideal. Sowing into cold, wet soil below about 55°F rots the seed and is the most common bean failure. Wait until after the last frost and use a soil thermometer rather than going by the calendar.

Generally no. Beans are legumes that host nitrogen-fixing Rhizobium bacteria in root nodules, so they supply their own nitrogen. Adding high-nitrogen fertiliser produces lush leaves and few pods. Plant beans in average soil; a light potassium/phosphorus feed at flowering can help heavy pole crops, but skip the nitrogen.

Sow a fresh short row of bush beans every 2-3 weeks from your first frost-safe sowing through to about mid- to late July, so each batch matures before the first fall frost. This staggers the harvest instead of giving one glut. Pole beans produce for months from one sowing, so one or two sowings can cover the same window if you keep picking.

Pick pods young — before the seeds bulge inside — when they snap cleanly and are pencil-thin to slim, and harvest every 2-3 days. Beans run on a feedback loop: if pods are left to mature seed, the plant stops flowering and production crashes. Constant picking keeps a healthy plant producing for weeks (bush) or months (pole).

French beans (Phaseolus vulgaris) are the UK equivalent of the US green or snap bean — bush or climbing, slim tender pods. Runner beans (Phaseolus coccinatus) are a separate, taller, coarser-podded species with scarlet flowers, a UK summer staple that needs consistently moist soil to set pods. They grow similarly but are different plants; Cobra is a popular French bean, Scarlet Emperor a classic runner.

Plain cooked or raw green bean pods are not on the ASPCA toxic list and are widely considered a safe, healthy treat for dogs in moderation. Serve them plain — no garlic, onion, butter, or salt, since onion and garlic are themselves toxic to pets — and cook dried mature beans. Offer cats only tiny amounts and introduce any new food gradually.

Add your location to Growli and it sets your first bean sowing for when soil reliably reaches 60°F after your local frost date, then schedules succession sowings every 2-3 weeks automatically and reminds you to keep picking. Photograph leaf or pod problems and Growli flags common bean issues like Mexican bean beetle, aphids, or halo blight.

Loose-leaf cultivars are ready in 30-45 days from sowing. Butterhead and romaine take 45-60 days. Microgreens are ready in 14-21 days. Cut-and-come-again harvest extends the productive window to 6-8 weeks per plant before bolting.

Buttercrunch is the most heat-tolerant butterhead — an AAS winner from Cornell University in 1963 and still the standard. Jericho romaine, bred in the Israeli desert, is the best heat-tolerant cos. Both hold their flavour at temperatures that bolt other lettuces. For very hot zones (US zone 9+), shift to autumn and winter sowing windows.

Sow a fresh batch every 14 days during cool weather (spring and autumn) for a continuous supply. A 2-foot row of loose-leaf every fortnight gives a family steady salad. Stop succession sowing 60 days before your first 27°C/80°F+ week, then resume in late summer for autumn harvest.

Yes — lettuce grows well indoors under a south-facing window or grow light, in shallow trays of seed-starting mix. Microgreens (harvested at 2-3 inches) are the easiest indoor crop. Full-size heads are harder indoors because lettuce wants cool conditions; aim for 15-20°C / 60-68°F.

Lettuce turns bitter when it bolts (sends up a flower stalk). The main cause is heat — temperatures over 27°C/80°F trigger bolting in most cultivars. Other causes: drought stress, age (plants over 8-10 weeks), and long summer days. Switch to heat-tolerant cultivars (Buttercrunch, Jericho), mulch heavily, and harvest young.

From seed — lettuce is one of the easiest crops to direct-sow, and seed packets give you 100+ plants for the price of 6 transplants. Buy transplants only if you need a 4-week head start in spring or you missed the spring sowing window.

Wait until outer leaves are 4-6 inches, then cut the outer 2-3 leaves at their base, leaving the central growth point untouched. New leaves appear from the centre within 5-7 days. Most loose-leaf and butterhead cultivars regrow 3-4 times this way. Don't cut the central whorl or the plant won't regrow.

Add your lettuce variety to Growli and the app sends a sowing reminder every 14 days so you never miss a succession. It also flags hot weeks coming in your forecast and suggests the heat-tolerant cultivar to swap in. Photograph any pest and Growli diagnoses common lettuce problems (slugs, aphids, downy mildew) with the fix.

A 4-inch cutting placed in water roots in 7-10 days. Transplant to a 6-inch pot once roots are 2 inches long. The plant is ready for first harvest 6-8 weeks after rooting. From a garden-centre transplant, expect a first harvest in 2-3 weeks and a full bushy plant by week 8.

Only if you accept it will spread aggressively. The RHS lists mint among its 'potentially invasive plants' because rhizomes travel 1-3 feet per year and resprout from tiny fragments. Always grow mint in a free-standing container on a hard surface, or in a sunken bucket with the rim above ground level.

Use a 6-inch pot with quality potting mix and place on the brightest south-facing windowsill. Water 2-3 times weekly. Mint indoors grows leggier and milder-flavoured than outdoor mint — supplement with a grow light for 10-12 hours daily in winter. Expect to refresh the plant from cuttings every 6-8 months.

Almost always thirst. Mint is the thirstiest common herb and wilts dramatically when soil dries out. Water immediately and the plant recovers within an hour. If wilting persists after watering, check for root rot — soggy compacted potting mix causes the same symptom but recovery is slower.

Grow it in a 12-inch container on a paved surface (not on soil — rhizomes escape through drainage holes). If you must plant in a bed, sink a 5-gallon bucket (drainage holes drilled) with the rim 2 inches above soil level and plant mint inside. Check the rim quarterly and snip any rhizomes climbing over.

The ASPCA classifies garden mint as toxic to cats, dogs, and horses, though large ingestions are needed for symptoms. The toxic principle is essential oils; clinical signs are vomiting and diarrhoea. Pennyroyal (Mentha pulegium) is significantly more dangerous — it contains pulegone, which can cause liver failure in pets. Avoid pennyroyal entirely if you have animals.

Start harvesting once the plant is 6 inches tall and bushy. Cut stems above a leaf node every 2-3 weeks during active growth (May-October in UK and US). Take the top third of stems each session; never strip more than half the plant in one cut. Flavour is strongest in the morning before the sun heats the leaves.

Add your mint variety to Growli and the app sets harvest reminders every 2-3 weeks tied to your local growing season. Photograph the plant and Growli flags pest issues (mint rust, aphids), suggests when to split the clump, and notifies you when nearby frost dates threaten outdoor containers.

Buy onion sets matched to your latitude — long-day if you garden north of latitude 36°N (US North, all of the UK), short-day if south of it. Plant them in early spring in full sun and rich free-draining soil, tip just showing, 4-6 inches apart. Keep the bed scrupulously weed-free, water evenly until the bulbs swell, then stop. Harvest when the tops flop over naturally and cure for 2-3 weeks before storing cool and dry.

Long-day onions form bulbs when days reach 14-16 hours and suit northern latitudes (about 37-47°N) — all of the UK and the US North. Short-day onions bulb at 10-12 hours and suit the US South, below latitude 36°N. Day-neutral hybrids bulb across a wide range and are the safe pick for the transitional middle band. Choosing the wrong type for your latitude is the main reason home onions stay tiny.

Sets (small immature bulbs) are the easiest and fastest, the best beginner option, but have a slightly higher bolting risk. Seed is cheapest with the widest variety choice and best storage potential, but needs an early indoor start because onions are slow. Transplants (bundled seedlings) combine the variety choice of seed with the head start of sets and are ideal for big storage onions.

Usually the wrong day-length type for your latitude (a short-day onion grown in the North, or vice versa) so the plant bulbs before it builds enough leaf. Other causes: too little sun, weed competition (onions have weak shallow roots), planting sets too deep, or too little water during leaf growth. Each leaf an onion grows before bulbing becomes a bulb scale, so maximise leaf growth early.

Stop watering once the bulbs have swollen and the necks begin to soften — usually when about half the tops have started to flop over. Watering at maturity keeps the necks from drying down and causes rot in storage. Let the plants sit dry for a week or two after the tops flop, then lift on a dry day.

Onions are ready when the tops yellow, soften at the neck, and flop over naturally (don't bend them by hand). Lift on a dry day with a fork, then cure for 2-3 weeks somewhere warm, dry, and airy until the necks are completely dry and the skins rustle. Store cured onions cool, dark, and dry; use thick-necked or bruised ones first.

Yes. The ASPCA lists onions (and all alliums) as toxic to dogs and cats. They contain thiosulfate compounds that destroy red blood cells and cause Heinz-body hemolytic anaemia. Cats are most susceptible. Raw, cooked, and powdered onion all count, and signs (weakness, pale gums, dark urine) can take days to appear. Keep onions and scraps away from pets and call ASPCA Poison Control at (888) 426-4435 if ingested.

Yes — use a container at least 8-10 inches deep with drainage holes and fill with quality potting mix. Space sets 3-4 inches apart for medium bulbs. Containers dry out fast, so water evenly through leaf growth, then ease off as bulbs mature. Choose a compact long-day or day-neutral variety, and give the container the sunniest spot you have.

Add your location to Growli and it recommends long-day, short-day, or day-neutral onions for your latitude, sets your spring planting window against your local frost date, and reminds you of the stop-watering date and the tops-flopping harvest signal. Photograph leaf problems and Growli flags allium issues like onion fly, downy mildew, or rot.

From a transplant, oregano is harvestable in 6-8 weeks and reaches mature size in one growing season. From seed, germination is 7-14 days and the plant is ready for first harvest in 12-16 weeks. From cuttings, roots form in 4-6 weeks.

Greek oregano (Origanum vulgare subsp. hirtum) is the strong-flavoured cooking standard with high carvacrol content — the source of true Mediterranean oregano flavour. Italian oregano (Origanum × majoricum) is a hybrid with sweet marjoram, milder and sweeter than Greek. For pizza and tomato sauces, Greek oregano delivers the classic flavour.

No — they are botanically unrelated. Greek oregano (Origanum vulgare subsp. hirtum) is in the mint family. Mexican oregano (Lippia graveolens) is in the verbena family, contains thymol and eugenol rather than carvacrol, and has a citrusy pungent flavour. They are not interchangeable in cooking — Mexican oregano in Italian tomato sauce tastes wrong.

Two common causes. First, you may be growing common oregano (Origanum vulgare) or generic supermarket oregano rather than Greek oregano (Origanum vulgare subsp. hirtum) — common oregano is genuinely mild. Second, oregano grown in shade or in over-rich soil produces weak essential oil content. Replant in full sun with lean gritty soil for full flavour.

Cut stems above a leaf node every 2-3 weeks during active growth. Take roughly the top third of each stem. The plant rebranches from the node below the cut. Never strip more than half the plant in one session. After summer flowering, give the plant a hard shearing back by a third to a half to drive a second flush of fresh leaves.

The ASPCA classifies oregano (Origanum vulgare) as toxic to dogs, cats, and horses. The toxic principle is gastrointestinal irritants; clinical signs are mild vomiting and diarrhoea with large ingestions. A pet nibbling a few leaves is low risk, but concentrated oregano essential oil is significantly more dangerous and should be kept away from pets entirely.

Yes — Greek and Italian oregano are perennials hardy in USDA zones 5-10 and across the UK. The plant dies back partially in winter and resprouts from the base in spring. Replace plants every 4-5 years as the woody base reduces leaf production. Mexican oregano is less hardy (zones 9-11) and is grown as an annual or overwintered indoors in cooler climates.

Add your oregano variety to Growli and the app schedules cut-and-come-again harvest reminders every 2-3 weeks, sets the post-flower shearing for your local climate, and warns you about overwatering symptoms from photographed plants. Growli also tracks the 4-5 year replacement cycle so you know when to take cuttings.

Germination is slow: 14-21 days with overnight pre-soaking, up to 28 days without. The plant is ready for first harvest 70-90 days after sowing, when it has 8-10 stems with full leaves. From a transplant, expect a first harvest in 4-6 weeks.

Parsley seeds have a tough seed coat and contain furanocoumarins that inhibit germination until they are washed out by sustained moisture. Pre-soaking in warm water overnight roughly halves germination time by leaching out the inhibitors. Keep soil consistently moist throughout germination — drying once kills the embryo.

Flat-leaf (Italian) parsley has larger leaves, stronger flavour, and is easier to chop — the standard cooking parsley. Curly parsley has tightly frilled leaves, milder flavour, holds its shape as garnish, and is slightly more cold-hardy. Most cooks prefer flat-leaf; most garnish work uses curly.

Parsley is a true biennial — it produces leaves in year 1, flowers and seeds in year 2, then dies. The flower stalk appears in late spring or early summer of year 2. Year-2 leaves turn bitter as the plant bolts. The fix is to sow fresh parsley every spring and treat the plant as an annual.

Yes — parsley is one of the most shade-tolerant culinary herbs. It thrives in 4-6 hours of direct sun and tolerates part shade better than basil, rosemary, or thyme. This makes it useful for the shadier side of a vegetable bed or a north-facing patio container.

The ASPCA classifies parsley as toxic to dogs, cats, and horses due to furanocoumarins, which can cause photosensitivity (skin redness, blistering) in large ingestions. A pet nibbling a few leaves is a low risk; sprinkling cooking-quantity parsley in pet food is generally safe in moderation, though some vets recommend avoiding it. Spring parsley (Cymopterus watsonii) is significantly more dangerous and should never be ingested by pets.

Cut outer stems at the base (just above the soil) and leave the central new growth untouched. Take no more than a third of the plant in one harvest. Repeat every 2-3 weeks during the growing season. Never pick individual leaves off stems — the stem itself stops producing once topped.

Add parsley to Growli and the app schedules the overnight pre-soak, sets the slow germination window so you don't lose patience, and reminds you to harvest outer stems every 2-3 weeks. Growli also tracks the biennial cycle, flagging when to replace year-2 plants before they bolt and bitter the leaves.

Start California Wonder or Bell Boy seed indoors 8-10 weeks before your last frost on a heat mat at 26-29°C. Harden off over 10-14 days. Transplant outdoors only once nights stay above 13°C, into full sun (6+ hours), in well-draining soil pre-warmed under black plastic. Space 45-60 cm apart, water deeply but let the soil surface dry between waterings, and switch from a balanced feed to high-potassium fertilizer at first flower. Pick green at full size or wait for full red color for sweeter fruit.

Sow seed 5-6 mm deep in seed-starting mix, two per cell, 8-10 weeks before your last frost. Bottom heat at 26-29°C is critical — without it germination drops below 40%. Expect 7-14 days to emergence with a heat mat. Provide a south window or grow light 5-10 cm above seedlings for 14-16 hours daily. Pot up to 9 cm pots at the first true leaves, keep nights over 18°C indoors, then harden off for 10-14 days before transplant.

Same as bell peppers — start indoors 8-10 weeks before your last frost on a heat mat at 26-29°C, then transplant after nights stay reliably over 13°C. Hot peppers (Jalapeno, Cayenne) germinate faster than sweet bells but still need bottom heat. Pot up to 9 cm pots at the first true leaves, harden off for 10-14 days, and plant at the same depth they grew in the pot — peppers do not root along buried stems the way tomatoes do.

Red peppers are simply ripe green peppers — most varieties (California Wonder, Bell Boy, Yolo Wonder) turn red if left on the plant. Grow them the same way as any bell pepper, but wait an extra 3-4 weeks past the green stage before harvesting. The plant will slow new fruit set while existing fruit ripens to red, so total yield is lower but flavor is sweeter and vitamin C content roughly doubles.

Choose a sweet-pepper variety (any bell, Sweet Banana, or a non-spicy frying type like Marconi). Sweet peppers need the same conditions as hot peppers — 6+ hours of sun, warm soil over 18°C, even watering, and high-potassium feed from flowering. They take longer to mature than chillies, typically 70-90 days from transplant. In cool UK summers grow under cover; in hot US zones provide afternoon shade above 32°C to prevent blossom drop.

Jalapenos are the most beginner-friendly hot pepper. Start seed indoors 8-10 weeks before your last frost on a heat mat. Harden off over 10-14 days, transplant after nights stay over 13°C, into full sun. Space 45 cm apart. Water deeply but let the surface dry between waterings, and feed with high-potassium fertilizer once flowering. Pick at deep green for classic flavor, or leave to turn red for sweeter, slightly hotter fruit. Expect 60-80 days from transplant to first pick.

From transplant to first ripe red bell: 70-90 days, depending on variety and weather. From seed-start to first green pepper: roughly 120-150 days total. California Wonder and Bell Boy ripen on the earlier end (around 70-75 days from transplant), while larger thick-walled varieties take closer to 90. Cool summers add 2-3 weeks; consistent warmth and bottom-heat seed starting shave time off the front end.

Hot peppers (Jalapeno, Cayenne, Padron, Shishito) take 50-80 days from transplant to first pick. Sweet bells take 70-90 days. From seed-start the total season is 100-130 days for hot peppers and 120-150 days for bells. That is why beginners in cooler climates often start with Padron or Jalapeno — they crop reliably before the autumn cooldown.

Add your pepper variety and location to Growli. The app builds a season-long calendar tied to your local last-frost date — seed-start reminders (8-10 weeks back), bottom-heat checkpoints, hardening-off windows, transplant timing, and fertilizer switch alerts when flowers appear. Photograph any symptom and Growli diagnoses common pepper problems (blossom drop, blossom end rot, sunscald, magnesium deficiency) and walks you through the fix.

Start seed indoors 8-10 weeks before your UK last frost on a heat mat at 26-29°C — without bottom heat, germination drops below 40%. Harden off over 10-14 days. Transplant outdoors only once nights stay reliably above 13°C, into full sun under cover (greenhouse, polytunnel, conservatory, or sheltered south-facing wall). UK greenhouse and polytunnel growing is the default for most British regions — outdoor peppers in northern England and Scotland routinely fail to ripen. Space 45-60 cm apart, water deeply but let the surface dry between waterings, switch from a balanced feed to Tomorite at first flower, and expect 70-90 days from transplant to first ripe bell.

Yes, but only in southern England and only with shelter. A sheltered south-facing wall, fence, or sunny patio against the house is the bare minimum for outdoor pepper success in the UK. North of the Midlands, outdoor pepper growing routinely fails to ripen before the autumn cooldown. Even in southern England, hot peppers (jalapeño, cayenne, Padron) outperform sweet bells outdoors because they need less heat to ripen. For reliable cropping anywhere in the UK, use a greenhouse, polytunnel, or coldframe — the RHS recommends this for all British pepper growing.

8-10 weeks before your UK last frost date. That works out to mid-February in south-west England, mid to late March in the Midlands, and early April in Scotland. Use a heat mat at 26-29°C — without bottom heat, germination drops below 40% and takes twice as long. Total indoor time before transplant is 8-10 weeks, then 10-14 days of hardening off, then transplant once nights stay above 13°C (typically mid-May in southern England, early to mid June further north).

Hot peppers are easier than sweet bells in UK conditions — they need less heat to ripen and crop faster. Beginner-friendly UK picks: Padron (Spanish frying pepper, picks small and green, RHS-stocked at £4.49), Jalapeño (RHS-stocked from £3.99, 60-80 days to ripe fruit, RHS Scoville rating 2,500-8,000), and Hungarian Hot Wax (early, tolerates cool UK nights). For sweet bells, Bell Boy F1 is the right choice for cooler UK summers — earlier than the classic California Wonder. Avoid super-hots (habanero, Carolina Reaper, ghost pepper) in year one — they need a longer hotter season than UK conditions deliver.

Strongly recommended, especially outside southern England. The RHS recommends greenhouse, polytunnel, conservatory, or coldframe growing for all UK peppers. The reasons: UK summer daytime temperatures stay 5-10°C higher under cover, nighttime temperatures stay above the 12-13°C minimum the RHS gives for chilli growing, rainfall is controlled (UK peppers in open ground rot easily in wet summers), and the season extends 4-6 weeks at both ends. Mini-greenhouses from B&Q, Wickes, or IKEA UK start at £20-80 and make outdoor pepper growing viable on a UK patio.

Tomorite (Levington 4-3-8) is the UK standard for peppers as well as tomatoes — the K-heavy NPK ratio is what peppers need from first flower onwards. Apply every 10-14 days through fruiting at half pack strength. Before flowering, no liquid feed is needed if your compost is fresh; Vitax Q4 granular (5-7-10) worked into the planting hole gives a slow-release base. Organic alternatives: comfrey tea diluted 15:1 weekly, or Maxicrop Original Seaweed as a fortnightly supplement. Add Epsom salts (1 tbsp per 4 L water) once a month if leaves yellow between veins.

Three common UK causes: nights consistently under 13°C (very common in May and June, which causes blossom drop), excess nitrogen from general-purpose feed or fresh manure (produces leafy plants with few flowers), or insufficient pollination in a sealed polytunnel (gently shake plants daily to release pollen, or open vents for airflow). Fix all three: wait for warm nights before judging, switch to high-K Tomorite at first flower bud, and ensure airflow under cover. UK peppers are particularly sensitive to cold nights compared to tomatoes — 13°C minimum is non-negotiable.

From transplant to first ripe fruit: 70-90 days for sweet bells, 60-80 days for jalapeños and cayennes, 50-70 days for Padron and Shishito. From seed-start the total UK season is 120-150 days for bells and 100-130 days for hot peppers — which is why British beginners in cooler regions should start with Padron or Jalapeño rather than bells. UK greenhouse and polytunnel growing speeds these timings by 1-3 weeks versus outdoor; northern outdoor growing can add 2-3 weeks of delay.

Add your pepper variety and UK location to Growli. The app builds a season-long calendar tied to your local last-frost date — seed-start reminders (8-10 weeks back), bottom-heat checkpoints, hardening-off windows, transplant timing (under cover vs outdoors), and the Tomorite-switch alert when flowers appear. Photograph any symptom and Growli diagnoses common UK pepper problems (blossom drop from cold nights, blossom end rot, sunscald, aphids, whitefly, magnesium deficiency) and walks you through the fix. Built by Justas Macys and Nojus Balčiūnas to handle the cool variable British pepper season properly.

Buy certified seed potatoes (not supermarket ones), chit them eyes-up in a cool bright spot for 4-6 weeks, then plant them 4-5 inches deep in full sun and loose, slightly acidic soil after the frost risk passes. As the stems grow, earth them up with soil so the developing tubers stay covered and don't turn green. Water consistently from flowering. Harvest first earlies about 10 weeks later; leave maincrop until the foliage dies back.

Chitting means sprouting seed potatoes indoors for 4-6 weeks before planting so they grow faster once in the ground. Stand the tubers eyes-up in an egg box somewhere cool (about 50°F / 10°C) and bright until short sturdy sprouts about 1 inch long form. It is most worthwhile for first earlies and helps the crop outrun early blight. Maincrop potatoes don't strictly need it.

Use a 10-15 gallon grow bag or bin with drainage holes. Put 4 inches of potting mix in the bottom, set 2-3 chitted seed potatoes on it, cover with 4 more inches, and keep adding mix as the stems grow until the bag is full. Water consistently — containers dry out fast and inconsistent watering causes hollow, cracked tubers. Tip the bag out to harvest.

Earthing up — drawing soil up around the stems as they grow — keeps the developing tubers in the dark so they don't turn green and toxic (green potatoes contain solanine). It also increases yield because more buried stem means more tubers, and it filters blight spores out of rainwater before they reach the tubers. Earth up every 2-3 weeks until the ridge is 10-12 inches high.

Yes. Green or sprouting potatoes contain solanine, a toxic glycoalkaloid produced when tubers are exposed to light. It is heat-stable, so cooking does not destroy it. Light surface greening can be deeply peeled away, but discard any potato that is deeply green, sprouting heavily, or tastes bitter. Store potatoes somewhere cool and dark to prevent greening.

Yes. Per the ASPCA, potato foliage, stems, sprouts, and green or raw tubers are toxic to dogs, cats, and horses because of solanine and related glycoalkaloids — cats are especially sensitive. Signs include drooling, vomiting, diarrhea, weakness, and tremors. Keep the dying foliage and any culled green tubers away from pets and call ASPCA Poison Control at (888) 426-4435 if ingestion is suspected.

First and second earlies are dug fresh about 10-13 weeks after planting, once the plants flower — eat these within days as they don't store. Maincrop potatoes are left until the foliage yellows and dies back; cut the tops, wait 2 weeks for the skins to set, then lift on a dry day and cure for 1-2 weeks before storing cool and dark.

Add your variety and location to Growli and the app builds a season calendar tied to your local frost date — when to start chitting, when to plant, when to earth up, and when first earlies versus maincrop are ready to lift. Photograph any leaf symptom and Growli flags likely problems like late blight or Colorado potato beetle and walks you through the response.

Plant bare-root canes during dormancy: November to March in the UK and late autumn or early spring in the US (after ground thaws). Container-grown plants go in any frost-free month, with spring and autumn rooting best. Use our frost-date calculator to find your safe local window.

Summer-fruiting raspberries (floricane) fruit on last year's canes in June-July, then those canes are cut to the ground. Autumn-fruiting raspberries (primocane) fruit on this year's canes from August to first frost, and all canes are cut down each winter. Autumn types are easier for beginners — one annual cut.

It depends on type. Summer-fruiting: after fruiting in July-August, cut the fruited canes to the ground and keep the new green canes for next year, thinning to 6-8 per metre. Autumn-fruiting: in February, cut every cane to the ground. Never cut autumn canes in summer or summer canes in winter — that removes the crop.

Plant canes 45 cm (18 inches) apart in a single row. If you're growing multiple rows, space them 1.8 m (6 ft) apart for access. Keep summer-fruiting and autumn-fruiting types in separate rows so the contradicting pruning rules don't get mixed up.

Yes — raspberries crop best in 6+ hours of direct sun, with afternoon shade tolerated in hot US zones. They'll fruit in partial shade but yields drop sharply and disease pressure rises. Wind shelter helps prevent the tall canes from snapping.

A well-tended raspberry row stays productive for 10-15 years. Yields drop as soil-borne viruses accumulate. When the row halves its yield, start a new row in fresh ground — never replant raspberries where raspberries grew before (soil sickness).

Yes — raspberry canes are 1.5-2 m (5-7 ft) tall and floppy. The standard support is post-and-wire: 2.4 m posts every 3 m, with three horizontal wires at 75 cm, 105 cm, and 165 cm. Tie canes to the wires with soft twine or rubber ties as they grow. Autumn-fruiting types tolerate a simpler double-wire system.

Add your variety and Growli sets pruning reminders matched to the cultivar type — summer-fruiting gets cut after fruiting; autumn-fruiting gets cut in late winter. Photograph wilted shoots and Growli diagnoses whether it's raspberry beetle, Botrytis, or Phytophthora root rot and walks you through the fix.

Yes — rhubarb leaves contain high levels of oxalic acid and anthrone glycosides and are toxic to humans and pets. The ASPCA classifies rhubarb as toxic to dogs, cats, and horses, with soluble calcium oxalates as the toxic principle. Signs of poisoning include vomiting, diarrhoea, tremors, drooling, and kidney failure. Only the stalks are edible. Always cut leaves off at the top of the stalk and discard.

In the UK, plant crowns in autumn (October-November) or early spring (February-March) while dormant. In the US, plant in early spring as soon as the ground is workable, or autumn in USDA zones 5-8. Container-grown plants can be planted in any frost-free month. Use our frost-date calculator to find your local window.

Grip the stalk near the base, twist gently while pulling outward and upward — it separates cleanly at the crown. Don't cut with a knife (leaves a stump that rots). Trim the leaf off at the top of the stalk and discard. Take no more than a third of the stalks at any one time, and stop harvesting by mid-July to let the plant recharge for next year.

No — do not harvest in year 1. A newly planted crown needs every leaf to photosynthesise and build root reserves. Take a light harvest of 2-3 stalks every 2-3 weeks in year 2, and harvest freely from year 3 onwards. Breaking the year-1 rule weakens the plant for years afterwards.

In late winter (January-February in the UK), cover a strong, mature crown (year 3+) with a forcing pot or large bucket, blocking all light. After 4-5 weeks, tender pale-pink stems are ready to harvest. Force the same crown only once every 2-3 years — forcing exhausts root reserves. The Royal Horticultural Society recommends using only well-established crowns.

Divide every 5-7 years, when stems get thinner and the crown becomes congested. In late autumn or very early spring, dig up the whole crown, cut it into 3-4 pieces with a sharp spade (each piece must have at least one healthy bud), and replant the divisions 90 cm apart in fresh ground with plenty of compost. Don't harvest from divisions in their first year.

Mature rhubarb sends up tall flowering stalks in response to stress — heat, drought, or age. Cut the flowering stalk off at the base as soon as you see it; flowering diverts energy from the crown. Repeated flowering is the plant telling you to divide. Established mature plants flower every few years naturally.

Add your variety and planting year to Growli and the app tracks the year-1 rule, forcing windows for compatible varieties (Timperley Early, Stein's Champagne), the safe harvest cutoff in midsummer, and division schedules every 5-7 years. Includes the leaf-toxicity safety reminder anytime you're harvesting with pets in the garden.

From a transplant, expect a usable culinary plant in 3-4 months and a mature shrub in 2-3 years. From cuttings, roots form in 4-8 weeks and the plant is harvestable in 6-8 months. From seed (rarely recommended), germination is slow and erratic and seedlings take 2 years to reach harvestable size.

Almost always overwatering or poor drainage. Rosemary in waterlogged soil develops root rot, drops needles, and rarely recovers. Check the soil — if it is wet 2 inches down, stop watering and improve drainage. A close second is cold damage: most cultivars are killed below -15°C unless they are the cold-hardy 'Arp' or 'Hill Hardy' cultivars.

'Arp' is the gold-standard cold-hardy upright rosemary, selected in 1972 by Madalene Hill from a wild Texas plant. North Carolina State Extension trials confirm it survives to roughly -23°C / -10°F. 'Madelene Hill' (also sold as 'Hill Hardy') is a more compact sport of 'Arp' with slightly milder flavour. Both reliably overwinter in USDA zone 6.

Bring the container indoors in late October before the first hard frost. Place in a bright, cool spot — an unheated conservatory, porch, or cool south-facing window with overnight temperatures around 4-10°C. Water only when fully dry (every 2-3 weeks). Avoid warm dim rooms, which kill more indoor rosemary than cold.

Less than you think. Established in-ground rosemary needs no water in normal UK and US rainfall. Container rosemary needs water only when fully dry to a depth of 2 inches — typically every 7-10 days in summer, every 14-21 days otherwise. Overwatering kills far more rosemary than drought.

The ASPCA classifies rosemary as non-toxic to dogs, cats, and horses. Cooking-quantity fresh rosemary is safe. Concentrated rosemary essential oil is not safe for pets — keep undiluted essential oils away from cats especially, as they cannot metabolise concentrated phenols. Consult a vet before applying rosemary-based products to pets.

Yes — use a 12-inch terracotta pot with a 70/30 potting-compost-to-grit mix. Place in full sun, water only when fully dry, and skip fertiliser. Repot every 2-3 years with fresh mix. Container culture is the standard approach in USDA zones 5 and colder, where the pot lifts indoors for winter.

Add your rosemary cultivar to Growli and the app schedules a frost alert calibrated to your local first-frost date, telling you exactly when to move the container indoors. Growli also tracks the cool indoor location requirement, sets sparse winter watering reminders, and warns you about overwatering symptoms from photographed plants.

June-bearing produces one big concentrated crop in June (one harvest window of 2-3 weeks). Everbearing produces two crops — a smaller one in early summer and a larger one in autumn. Day-neutral, often grouped with everbearing, fruits continuously from late spring to frost. For fresh eating, pick a day-neutral (Albion, Mara des Bois). For jam batches, pick a June-bearer (Honeoye, Cambridge Favourite).

Spring in cold zones (US zones 3-5, planted as soon as soil can be worked) and autumn in mild zones (US zones 7+, UK, planted September-October). Autumn planting gives plants a full winter to root before spring growth. Spring planting in cold zones avoids winter frost-heave on shallow-rooted young plants.

The crown must sit exactly at soil level — the thick white knob between roots and leaves. Bury it and it rots; expose it and the roots dry out. Dig a wide hole, make a small mound, drape the roots fan-wise over the mound, set the crown at soil level, backfill, and water in.

Productivity peaks in years 2 and 3 then declines sharply. By year 4, yields drop and disease risk rises. University Extension consensus: replant the bed every 3-4 years, ideally in a new location. Use rooted runners from healthy plants to renew, or buy certified virus-free plants if the old bed showed virus symptoms.

Two main causes. Inconsistent watering produces small fruit — strawberries need 1 inch per week consistently. Deformed lopsided fruit usually means poor pollination — plant pollinator-attractants (borage, lavender, alyssum) nearby and avoid overhead watering during flowering. Spider mite damage also reduces fruit size; check leaf undersides.

Yes — strawberries are one of the best fruit for containers. Use strawberry pots, hanging baskets, or window boxes, with 4 litres (1 US gallon) of potting mix per plant. Water daily in summer, feed weekly with a balanced fertiliser once fruit sets, and overwinter in a sheltered spot in cold zones (containers freeze faster than ground beds).

Three reasons. The straw keeps fruit off bare soil (preventing mud splash and rot). It blocks contact with soil-dwelling grey mould spores. And it suppresses weeds, which strawberries compete poorly against. The English name 'strawberry' probably comes from this practice. Black plastic or weed-suppressing membrane work as alternatives but straw is the home-garden standard.

Add your strawberry variety and zone to the Growli app. The app builds a multi-year calendar — planting prompts, mulching reminders, fruit-set tracking, post-harvest feeding, and year-3 replant alerts. Photograph any pest or disorder and Growli diagnoses common strawberry problems (slug damage, grey mould, spider mites, virus symptoms) with the fix.

Thyme germinates in 14-21 days at 20-22°C. Seedlings are slow — expect 8-10 weeks indoors before the plant is large enough to transplant outdoors. From a garden-centre transplant, the plant is ready for light harvesting in 4-6 weeks and full harvest by mid-summer.

Thyme is a sub-shrub and the centre naturally becomes woody and bare after 3-4 years. The fix is annual shearing after flowering — cut the plant back by a third into green growth (never into bare wood). Plants older than 5 years rarely recover and should be replaced from cuttings or new transplants.

Yes, but it needs the sunniest spot you have — a south-facing windowsill with 6+ hours of direct sun, or a grow light for 12 hours daily. Use a free-draining mix (potting compost + 30% grit), water only when fully dry, and skip feeding. Indoor thyme lives 1-2 years before becoming leggy and needing replacement.

Yes. Creeping thyme (Thymus serpyllum) has a milder flavour than common thyme but the leaves are fully edible. It is most commonly grown as ground cover or between paving stones rather than as a primary cooking herb, but a light sprinkle on roast vegetables or in honey works well.

Less than you think. Established thyme tolerates drought and is killed faster by overwatering than underwatering. Container thyme needs water every 5-7 days in summer when fully dry; in-ground thyme survives on rainfall alone in most UK and US climates. The number-one rule is never water unless the soil is fully dry.

The ASPCA classifies common thyme (Thymus vulgaris) as non-toxic to dogs, cats, and horses. Pets nibbling fresh thyme leaves are safe. Concentrated thyme essential oil should be kept away from pets — cats in particular cannot metabolise concentrated phenols safely.

Use a 6-inch terracotta pot for one plant. Fill with a free-draining mix (70% potting compost, 30% horticultural grit or perlite). Place in 6+ hours of direct sun. Water only when fully dry. Skip the fertiliser — thyme produces more flavour in lean soil. Repot every 2-3 years with fresh mix.

Add thyme to Growli and the app calibrates watering reminders to local rainfall (never overwatering), schedules the post-flower haircut for your local climate, and warns you about root-rot symptoms in photographed plants. Growli also tracks the 4-5 year replacement cycle so you know when to take cuttings.

Buy 4-5 starter plants from a garden center (Celebrity, Sungold, and Roma are reliable beginner varieties), plant them after your last frost date in a sunny spot with at least 6 hours of direct sun, add a cage or stake at planting, water deeply 2-3 times per week, mulch heavily, and feed with a balanced fertilizer at planting then high-potassium when flowers appear. Don't start from seed your first year — buy transplants.

Plant outdoors after your last expected frost. That's typically mid-March in US zone 9, late April in zone 7, mid-May in zone 5-6, late May in UK southern England, and early June in UK Scotland or US zones 3-4. If starting from seed indoors, count back 6 weeks from your transplant date.

Start seeds indoors in seed-starting mix 6 weeks before your last frost. Plant 1/4 inch deep, keep soil at 21-27°C, and provide bright light (south window or grow light) as soon as seedlings emerge. Pot up to 4-inch containers when the first true leaves appear. Harden off for 7-10 days before transplanting outdoors after the last frost.

From transplant to first ripe fruit: 50-85 days depending on variety. Cherry tomatoes (Sungold) ripen earliest — about 55-60 days from transplant. Beefsteak tomatoes (Cherokee Purple, Brandywine) take 80-90 days. From seed start to harvest is roughly 100-140 days total.

Use 5-gallon (19 L) containers minimum — bigger is better for tomatoes. Fill with quality potting mix (not garden soil). Plant deep. Add a sturdy stake or cage immediately. Water daily in summer; container soil dries fast. Feed weekly at full pack strength once flowers appear. Choose container-bred varieties (Patio, Bush Early Girl, Roma) for best results.

Same as 'in pots' above. The keys: 5-gallon minimum container, potting mix (not garden soil), daily watering in summer, weekly feeding from flowering, and a container-friendly variety. Indeterminate varieties work in containers but need much larger pots (10-gallon+) and more attention to watering.

About 50-90 days from transplant to first ripe fruit, depending on variety. The plant flowers within 30-45 days of transplant; flowers become fruit within 7-10 days; fruit takes another 20-40 days to ripen depending on variety size. Cherry varieties produce fastest; beefsteaks take longest.

Add your tomato variety and location to Growli. The app builds a season-long calendar tied to your local last-frost date — seed-start reminders, harden-off windows, transplant timing, fertilizer timing, and expected first harvest. Photograph any symptom and Growli diagnoses common tomato problems (blossom end rot, leaf curl, yellowing) and walks you through the fix.

Sow seeds indoors on a sunny windowsill or heated propagator in mid- to late March. Plant out into a greenhouse from late April (south) to mid-May (north). Plant out outdoors in late May (south) to early June (Scotland and northern England). Wait until night temperatures stay above 10°C. A late May frost will wipe out your seedlings.

For beginners: Gardener's Delight (cherry, cordon, prolific), Tumbling Tom (basket bush variety), or Sungold F1 (the sweetest cherry). For outdoors with blight risk: Crimson Crush F1 or Mountain Magic F1, both blight-resistant. For a greenhouse staple: Shirley F1 or Alicante. Start with two cordon and one bush variety in year one.

Once a week from the moment the first flowers open, increasing to twice a week during peak cropping in July and August. Use the bottle-recommended dilution. Stop feeding 2 weeks before the final harvest in September or October. Tomorite is high-potassium, which the plant needs for flower and fruit production rather than leafy growth.

Yes, but only south of Birmingham reliably and only with blight-resistant varieties (Crimson Crush, Mountain Magic, Crimson Plum) or in a covered spot like a south-facing wall with a cloche. North of the Midlands, outdoor tomatoes are a gamble — most years you will get a crop, but a wet July will end the season early via blight. A cheap polytunnel or greenhouse transforms results.

The best prevention is growing under cover (greenhouse or polytunnel). For outdoor growing: choose blight-resistant varieties, remove lower leaves to lift foliage off the soil, water at the base never on leaves, space plants well for air flow, and sign up for free Smith Period alerts at Blightwatch.co.uk. There is no fungicide approved for home gardeners that cures blight once it strikes.

Grow bags fit two plants comfortably. Cut large planting holes in the top, push the bag into a deep tray, and water through the tray to keep the lower compost moist. Use ring-culture pots (bottomless pots stood on the bag) for deeper rooting. Feed weekly with Tomorite from first flowering and water daily in hot weather — grow bags dry out faster than any other container.

Cordon varieties grow 1.8-2.5 metres in a good greenhouse, 1.5-2 metres outdoors before being stopped in August. Bush varieties grow 30-60 cm tall and sprawl outward. Plan greenhouse and cane heights accordingly — cordon supports must be at least 2 metres.

Pinch out the growing tip ('stop' the plant) when it reaches the top of the greenhouse or has set 5-6 trusses outdoors. In UK conditions, this is typically mid-August for outdoor cordons and mid-September for greenhouse plants. Stopping directs energy into ripening existing fruit before the season ends in October.

Add your tomato variety and UK postcode to Growli. The app builds a season-long calendar tied to your region's last frost date — sowing reminders, harden-off windows, planting-out timing, Tomorite feeding schedule, and expected first harvest. Photograph any symptom and Growli diagnoses common tomato problems (blossom end rot, leaf curl, yellowing, early-stage blight) and walks you through the fix.

Most cultivars produce their first fruit in 50-60 days from direct-sown seed. Defender F1 and Black Beauty are among the fastest at around 50 days. Round types like Eight Ball mature in about 55 days. Once production starts, fruit goes from flower to harvestable size in 4-7 days, so check plants every other day.

One plant per 2-3 people is plenty. A single healthy zucchini plant produces 6-10 fruit per week at peak season for 6-8 weeks — 50-80 zucchini per plant total. A family of four needs only 2-3 plants for fresh eating. Plant more only if you're preserving, gifting, or running a market stall.

The first flowers on a young plant are almost always male and drop naturally. If female flowers (the ones with a tiny zucchini behind them) yellow and rot without growing, that's poor pollination. Hand-pollinate at mid-morning by transferring pollen from a male flower to female flowers with a brush or directly with the flower itself.

That's blossom end rot — a calcium uptake failure caused by inconsistent watering. Fix by mulching with straw or grass clippings, watering deeply and regularly, and adding a tablespoon of agricultural lime or a handful of crushed eggshells to each planting hole at sowing. Affected fruit can be cut and used; later fruit will be normal once watering is consistent.

Yes, but use 30+ litre containers (8+ US gallons) per plant and pick a bush cultivar like Defender F1 or Eight Ball. Fill with quality potting mix, water daily in summer, and feed weekly with diluted balanced fertiliser once flowers appear. Container plants are less productive than in-ground ones but still give a household 3-5 fruit per week at peak.

They're the same plant (Cucurbita pepo). Zucchini is the US name (borrowed from Italian); courgette is the UK name (borrowed from French). All the same cultivars and care apply — Defender F1 is sold as a courgette in the UK and a zucchini in the US.

Three things: pick every other day before fruit get oversized, water deeply and consistently, and side-dress with a high-potassium feed every 2 weeks once flowering starts. Remove yellow leaves to improve airflow and slow powdery mildew. If a plant tires by mid-August, sow a second crop in June for a fresh wave in September.

Add your zucchini variety and location to the Growli app. The app sends sowing alerts tied to your last frost date, transplant prompts, side-dressing schedules, and a reminder to pick before fruit oversize. Photograph any leaf or fruit symptom and Growli diagnoses common zucchini problems (blossom end rot, powdery mildew, poor pollination) with treatment steps.

Hot composting in a properly built 1-cubic-yard pile produces finished compost in 4-8 weeks. The keys are: minimum pile size (90×90×90 cm), 2:1 brown-to-green ratio by volume, moisture like a wrung-out sponge, and turning every 1-2 weeks. The pile should heat to 55-70°C within 5 days of building. Cold piles take 6-18 months without the turning effort.

Roughly 2 parts browns to 1 part greens by volume — equivalent to about 30 parts carbon to 1 part nitrogen by weight. Browns are dry carbon-rich materials (autumn leaves, straw, cardboard, wood chips, dry stalks). Greens are nitrogen-rich (kitchen scraps, fresh grass clippings, coffee grounds, garden trimmings, manure). If you have too many greens, the pile smells of ammonia; too many browns and it won't heat up.

Yes. Cold pile composting continues through winter, just slower (microbial activity drops below 5°C). Hot piles with adequate mass (1+ cubic yard) and tarp covering can stay warm inside even when ambient temperatures are below freezing. Insulating with straw or piling autumn leaves around the outside helps. Tumbler bins are slowest in winter — they don't retain enough mass for self-insulation.

Avoid: meat, dairy, cooked food, oil (attract rodents + smell); dog or cat waste (pathogen risk for edible gardens); diseased plants (many spores survive home compost temperatures); weeds with seeds or perennial roots (bindweed, ground elder, couch grass — they regrow); glossy magazine paper + thermal receipts (chemical-coated); pressure-treated wood, sawdust, or chips (may contain arsenic, copper, chromium from older treatments banned 2003 US / 2005 UK); coal ash; large quantities of citrus.

Three most likely causes: pile too small (under 1 cubic yard / 90×90×90 cm — needs critical mass for self-insulation), too much carbon vs nitrogen (add greens like kitchen scraps, coffee grounds, fresh grass clippings), or too dry (sprinkle water until a handful releases a few drops when squeezed). After fixing whichever cause applies, a properly mixed pile should reach 55-70°C within 2-5 days. If the pile is wet but cold + smells of ammonia, you have the opposite problem — too much nitrogen, add browns.

Yes. For flats without garden space: Bokashi bins (anaerobic kitchen pre-composters using Bokashi bran) handle kitchen waste in a sealed countertop bin. For tiny gardens: a 200-300 L tumbler bin works in 1 square metre and handles a 2-3 person household's kitchen waste plus modest garden waste. Worm bins (vermicomposting) under the sink work for kitchen-only composting in any space. Council kerbside collection picks up the rest.

Hot pile (managed, 1+ cubic yard, turned every 1-2 weeks): 4-8 weeks plus 2-4 weeks curing. Cold pile (no turning, mixed materials, any size): 6-18 months. Tumbler bin: 4-12 weeks depending on temperature + turning frequency. Stationary bin without turning: 3-6 months. Bokashi pre-composting: 2 weeks fermentation + 4-6 weeks bury in soil to fully break down.

Add your compost system to Growli (hot pile, cold pile, tumbler, or bin) and the app sends turn reminders calibrated to your method. Growli also tracks seasonal additions (autumn = leaf mould, spring = grass clippings season) and warns if the brown-to-green ratio looks off based on what you've added. For new composters, Growli's photo-recognition can confirm whether your pile looks finished or needs more time before garden use.

Pinch the top growing tip just above a leaf node (where two side shoots are forming) every 2-3 weeks once the plant is 6 inches tall. The plant branches into two new stems from each cut. Repeat through the season and remove any flower buds as soon as they appear.

Wait until the plant has 3+ sets of true leaves and is at least 6 inches tall. Find the second or third node down from the top, where you can see clear side-shoot buds in the leaf axils. Pinch the stem 1/4 inch above that node. Two new branches emerge within a week.

Same method as any basil — pinch above a node where side shoots are forming. Sweet (Genovese) basil branches readily and stays compact with regular pruning. Aim for a session every 2-3 weeks once the plant is established.

Same node-pinching method, but Thai basil has a more open habit and flowers earlier. Prune slightly more aggressively (every 10-14 days during peak growing season) and remove flower spikes weekly. Thai basil prunings root readily in water for propagation.

Same approach, with more frequent watering and quarter-strength feeding after each pruning session. Container basil grows fast and runs out of nutrients quickly. Move the pot to maximum sun (6+ hours direct) after a prune to drive regrowth.

Two rules. First, always cut the stem above a node (not individual leaves). Second, do it on a 2-3 week schedule and never skip — leggy basil with bare lower stems rarely recovers. The branching response only happens when nodes have viable side-shoot buds, which fade if the stem gets too woody.

Every pruning session is a harvest. Take the top third of the main stem and the smaller side branches as needed for cooking. Aim to remove no more than 40-50% of the plant's leaves in a single session. Use the leaves fresh, freeze in olive oil, or root the cuttings to grow new plants.

Photograph your basil in Growli and the app marks exactly where to make the next cut. Growli also sets a reminder for the next pruning session (every 2-3 weeks tied to your local growing conditions) and flags flower buds in your photos so you know to remove them before the plant bolts.

Start small. Pick the sunniest 4×8-foot spot in your yard (or 3 large containers if you're renting), buy bagged garden soil and 5 starter plants (tomato, lettuce, basil, bush bean, herbs), and water 2-3 times a week. Skip the elaborate planning — one season of doing tells you more than a winter of reading.

A 4×4-foot raised bed or 3-4 large containers is enough for one household. Plant high-value crops that are expensive to buy fresh: tomatoes, herbs, salad greens, snap peas. Skip space-hogs like sweet corn, winter squash, and main-crop potatoes — they take too much room for the yield.

Pick the spot that gets 6+ hours of direct sun, ideally facing south. Test soil drainage by digging a 12-inch hole, filling with water, and timing how long it takes to drain (under 12 hours = drains well). If your soil is heavy clay, build a raised bed instead of fighting the soil.

Three rules: start small (4×8 ft or 3 containers max), grow what you actually eat (don't plant okra if you don't cook it), and choose easy crops the first year (tomatoes, lettuce, bush beans, radishes, herbs). One successful 4×8 bed is more useful than a 20×40 disaster.

Buy a 4×8 raised bed kit (cedar lasts longest), set it on level ground in 6+ hours sun, fill with 50% topsoil + 30% compost + 20% perlite. Skip the cardboard-bottom step unless you have aggressive bermuda grass. Plant tomatoes, peppers, and herbs on the sunny side; lettuce and shade-tolerant crops on the cooler side.

Use 5-gallon (19 L) containers minimum for tomatoes and peppers, 3-gallon for herbs and lettuce. Buy quality potting mix — NOT garden soil, which compacts. Containers need daily watering in summer and weekly fertilizer because nutrients leach with each watering. Choose dwarf or container-bred varieties.

Step 1: identify the sunniest spot. Step 2: test soil drainage. Step 3: choose in-ground (if soil is decent) or raised bed (if soil is clay/rocky/contaminated). Step 4: buy 5 starter plants from a garden center for the first season — don't start from seed your first year. Step 5: water deeply 2-3x per week. Adjust based on results next year.

The easiest way to start a veggie garden is one 4x8 raised bed in your sunniest spot, filled with bagged topsoil and compost, planted with 5 transplants from a garden center — one cherry tomato, one bush bean six-pack, one basil, one lettuce six-pack, and one zucchini. Water deeply twice a week and you'll harvest something within 30 days.

A good beginner vegetable garden is small (one 4x8 raised bed or 3-4 large containers), focused on 5 forgiving crops, sited in 6+ hours of sun, and within view of the back door. It looks under-planted in May and full by July. The bed has 2-3 inches of mulch, drip irrigation or a soaker hose, and a simple plant label for each variety so you remember what worked.

Three setups: in-ground bed costs $50-150 (soil amendments + seeds + cheap tools) for the first year; raised bed kit + soil + plants runs $200-500; container garden with 6 containers + mix + plants is $100-300. The recurring cost after year 1 drops sharply because raised beds and tools last 5-15 years.

Fast, lightweight leafy crops are by far the most reliable: lettuce, basil and other soft herbs, salad greens (rocket, mizuna, pak choi, baby kale), and microgreens. These suit every system including the passive Kratky method. Fruiting crops — tomatoes, peppers, cucumbers, strawberries — are possible in DWC or Dutch-bucket systems but need much stronger light, physical support, and active aeration. Root crops and large brassicas are a poor fit for home water-culture systems.

The Kratky method is a passive, non-electric form of Deep Water Culture: a reservoir, a net pot, and nutrient solution with no pump or power. The water level is set so roots reach the solution while an expanding air gap forms above it as the plant drinks the reservoir down, supplying root oxygen. It was developed and published by Dr. B.A. Kratky at the University of Hawaii and is the simplest, most beginner-friendly hydroponic system — ideal for a first lettuce or herb crop.

In DWC (Deep Water Culture) the roots sit submerged in a reservoir of nutrient solution kept oxygenated by an air pump and air stone. In NFT (Nutrient Film Technique) a pump circulates a thin film of solution down sloped channels while the upper roots stay in air for oxygen. DWC is simpler and more forgiving of heavy feeders; NFT is more space- and water-efficient and scales for volume lettuce, but dries roots within an hour if the pump fails.

Generally pH 5.5 to 6.5 for most vegetables, which is the band where nitrogen, phosphorus, iron, and the other nutrients stay plant-available. pH tends to drift — often upward as plants feed — so test regularly with a meter or drops and correct with pH-up or pH-down solutions. Drifting pH is the most common cause of nutrient deficiencies appearing in an otherwise correctly fed hydroponic system.

Yes. Use a complete nutrient designed specifically for soilless growing — it supplies the full micronutrient profile and correct nutrient forms that regular garden or houseplant fertiliser lacks. Widely used home product lines include General Hydroponics Flora Series, Masterblend, and FoxFarm liquid nutrients, but formulations and availability change, so confirm a current hydroponic-specific product with the retailer and follow the label rates for your crop and growth stage.

As of 2026, AeroGarden products are available again, but the brand has had a volatile history: it publicly wound down in 2024 and then reversed course in 2025. Because ownership and continuity have been unstable, confirm warranty support and ongoing seed-pod availability before buying. Click & Grow, IDOO, and Lettuce Grow remained available through 2026, and DIY DWC or Kratky setups avoid brand-continuity risk entirely.

Faster than soil for leafy crops, when light, pH, oxygen, and nutrient strength are correct. Hydroponic lettuce is commonly harvested 3 to 5 weeks from transplant, and microgreens in 1 to 3 weeks. The speed comes from roots having constant access to water, dissolved nutrients, and oxygen with no soil resistance. The trade-off is no buffer — a failed pump, drifted pH, or warm solution causes problems faster than in soil too.

Log your system type and crops in Growli and it schedules the recurring tasks hydroponics depends on — nutrient solution changes, pH and EC checks, reservoir top-ups, and harvest timing — so the maintenance rhythm that replaces soil's natural buffering does not slip. Growli also helps diagnose nutrient deficiencies and root-rot symptoms from leaf appearance, which in hydroponics usually trace back to pH drift or warm solution rather than feeding.

For most organic mulches (bark, wood chips, straw, leaf mould), apply 5 to 8 cm (2 to 3 inches). Compost is denser, so 2 to 5 cm is enough. Newly planted trees can take 7 to 10 cm of arborist wood chips, but keep 10 cm clear of the trunk. Deeper than 10 cm and the mulch traps water against stems and starts anaerobic decomposition underneath that damages roots.

Spring is the main mulching event: apply once the soil has warmed above 10°C / 50°F at 10 cm depth. That is April in US zones 7 to 10, mid-May for US zones 4 to 6 and most of the UK. Autumn is a lighter second application of 3 to 5 cm before the first hard freeze, protecting perennial crowns and tree roots. Do not mulch cold wet spring soil — it stays cold and wet.

A mulch volcano is mulch piled in a cone shape against a tree trunk — common but damaging. It causes bark rot from trapped moisture, adventitious roots that eventually girdle the trunk, and is associated with reduced tree growth and decay in peer-reviewed arboriculture research (see the 2025 systematic review in Arboriculture & Urban Forestry). The fix is simple: pull the mulch back 10 cm so you can see the root flare, then spread the rest in a flat doughnut shape out to the drip line.

Only at the soil surface, and only briefly. Decades of research by Washington State University Extension show that fresh wood chips create a 1 to 2 cm nitrogen-depletion zone where the chips meet the soil — the deeper root zone is unaffected. Do not dig fresh wood chips into the soil; use them as a surface mulch only. After 6 to 12 months the underside has decomposed into rich humus.

Straw is the dried stalk of cereal grains (wheat, oats, barley, rye) after the seed head is harvested — it contains few viable seeds. Hay is dried grass cut with the seed heads attached — it introduces grass and weed seeds into your beds. Always buy straw for vegetable mulch. Confirm the straw is not contaminated with persistent herbicides (aminopyralid, clopyralid) by buying from a source that guarantees it is herbicide-free.

The dyes themselves (iron oxide for red, carbon for black) are inert and safe. The concern is the source wood underneath — some dyed mulches use chipped pallets or construction waste, which may include older pressure-treated wood (CCA-treated timber containing arsenic, chromium, and copper was banned for residential use in 2003 in the US and across the EU by 2004). For vegetable beds, stick with undyed bark, arborist wood chips from a known crew, straw, leaf mould, or compost. Save dyed mulch for ornamental beds well away from edibles.

Compost: 4 to 12 months — much disappears into the topsoil in one season. Straw: 6 to 12 months. Leaf mould: about 12 months. Arborist wood chips: 12 to 24 months. Shredded bark: 18 to 36 months. Pine straw: 12 to 18 months. Gravel and decorative stone: indefinite. Plan to top up organic mulches each spring to maintain the 5 to 8 cm depth.

Add each garden bed to Growli and the app tracks when you last mulched, what type you used, and reminds you when the mulch has likely broken down (12 to 18 months for most organic mulches). For new trees, Growli flags the mulch-volcano risk and gives you a doughnut-shape diagram to follow. For each plant, the app recommends the right mulch type — gravel for Mediterranean herbs, compost for vegetables, leaf mould for woodland perennials, pine straw for acid-lovers.

No-dig gardening means never digging, tilling, or turning the soil. Instead you add a layer of compost to the surface each year and let earthworms and soil organisms incorporate it downward, the way a woodland floor builds soil. To start a bed you lay cardboard over weeds and grass, top it with 5 to 10 cm of compost, and plant straight in. It is most associated with UK market gardener Charles Dowding, who runs documented side-by-side dig vs no-dig trials.

Cut tall growth to the ground (leave roots in place to rot). Lay plain corrugated cardboard over the whole footprint, overlapping every seam by at least 15 cm and removing all tape, staples, and plastic. Soak the cardboard thoroughly. Spread 5 to 10 cm of well-rotted compost on top (10 to 15 cm over rough or weedy ground). Plant or sow straight into the compost the same day — no need to wait for the cardboard to rot.

Yes, by two mechanisms. The initial cardboard layer excludes light and smothers existing weeds and grass plus germinating weed seeds beneath it while it rots over 6 to 12 weeks. Long-term, never digging means dormant weed seeds stay buried instead of being lifted to the surface and triggered to germinate with every dig — so the visible weed load falls year on year. Reduced weeding labour is the single most-reported practical benefit of no-dig.

Charles Dowding is an English market gardener and the best-known modern teacher of the no-dig method. He runs Homeacres, a no-dig market garden in Alhampton, Somerset, where he has maintained side-by-side dig versus no-dig beds for years and published the comparative results through books, courses, and an extensive video archive. As of 2026 he remains active — publishing an annual sowing-dates calendar and running courses. He is a horticulturist and educator, not the originator of the underlying no-till soil science.

After the initial 5 to 10 cm setup layer, no-dig beds need a maintenance top-up of roughly 2.5 to 5 cm (1 to 2 inches) of compost spread over the surface once a year, typically in autumn or late winter. It is laid on top, never dug in — worms do the incorporation. This single annual layer is the entire fertility programme for most home no-dig beds. A reliable annual compost supply is the method's main ongoing input.

Yes. Carrots, parsnips, and other fine direct-sown roots grow well in no-dig beds and the loose, undisturbed soil often produces straighter roots than dug soil. The one adjustment is the seedbed: sow into a finer compost or a sieved compost-and-soil topping rather than coarse chunky compost, because fine seed needs even contact. Potatoes are a no-dig favourite — laid on the surface and mulched, then harvested by pulling back the mulch.

For soil structure, biology, weed load, and labour, the no-dig evidence and long-running practitioner trials favour it: undisturbed soil keeps its crumb structure, fungal networks, and worm channels, and digging refreshes the weed-seed bank every time. Reduced-tillage soil-structure and carbon benefits are well established in agronomy. The trade-off is needing a reliable annual compost supply, and first-year results depending heavily on compost quality.

Growli tracks the annual compost top-up timing (the core of no-dig fertility), schedules succession sowings and relay cropping into the fast-turnaround no-dig beds, and builds the harvest calendar around your frost dates. As you log crops it suggests immediate replacements when a bed clears — exactly the rapid succession that undisturbed no-dig beds enable — and flags compost-quality issues like persistent-herbicide damage symptoms.

For most vegetables, 30 to 45 cm / 12 to 18 in. Leafy greens, salads, herbs, and radishes manage in 15 to 20 cm / 6 to 8 in, but only if good soil sits below. Carrots, parsnips, leeks, and other deep-rooted vegetables need 45 to 60 cm / 18 to 24 in. Most gardeners are better off building a 45 cm bed that handles 95 percent of vegetables comfortably, rather than a shallow bed that limits crop choice.

Cedar (Western Red or Northern White) is the residential gold standard — naturally rot-resistant, food-safe, 10 to 20 year lifespan untreated. UK alternatives: larch, Douglas fir (10 to 15 years), oak or sweet chestnut (20+ years, expensive). Avoid old pressure-treated CCA wood (banned for residential use in the US December 2003 and across the EU from 2004) and avoid railway sleepers (creosote, carcinogenic). Modern ACQ pressure-treated lumber is considered acceptable by most US Extension services, optionally lined with plastic between wood and soil.

Three good options. (1) Mel's Mix from Square Foot Gardening: 1/3 finished compost, 1/3 coco coir or peat moss, 1/3 vermiculite or perlite — premium, expensive at scale. (2) Budget blend: 60 percent good topsoil, 30 percent finished compost, 10 percent coarse sand or perlite — much cheaper for large beds. (3) No-dig fill (Charles Dowding): cardboard on the bottom, topsoil up to 10 cm from the top, then 10 cm of finished compost on top — plant directly into the compost layer.

For raised beds sitting on open soil — no. Water drains directly into the ground below. Fill the bed with growing medium right to the bottom. For raised beds on a hard surface (patio, concrete, paving), you have a container rather than a true raised bed and a drainage layer may help; a 2025 PLOS ONE study by Avery Rowe actually found drainage layers improve rather than harm container drainage in most cases, contradicting older 'perched water table' advice. The better fix for hard-surface beds is drilling drainage holes or raising the bed on bricks to create an air gap.

Maximum 1.2 m / 4 ft if you can reach from both sides; maximum 60 cm / 2 ft if it sits against a wall or fence with single-sided access. The principle: you should never need to step into the bed because foot traffic compacts the soil. The average adult reaches comfortably 60 cm from each side. Length is flexible — common choices are 2.4 m, 3 m, or 3.6 m to match standard board lengths. Add cross-bracing for beds longer than 3.6 m to prevent soil pressure bowing the sides.

Yes for modern galvanised steel beds (Birdies, Vego, and similar). Modern galvanisation uses zinc + aluminium magnesium alloy coatings approved for food contact under EU and FDA standards. The zinc coating is mildly alkaline but does not leach into soil at meaningful rates. Soil temperature concerns are overblown — Cornell and Texas A&M trials show galvanised-steel-bed soil is within 1 to 2°C of cedar beds in summer. Avoid using old corrugated roofing or unknown reclaimed metal, which may have been painted with lead-based coatings.

Not if it pre-dates 2003 (US) / 2004 (EU + UK). Older CCA-treated wood (chromated copper arsenate) is no longer permitted for new residential use because of arsenic concerns, but legacy timber still exists in many gardens. Identifying CCA wood: faint greenish tint, end-stamp may include 'CCA-C' or 'CCA-B', dates pre-2004. Modern ACQ pressure-treated lumber (alkaline copper quaternary) is post-2003 and considered safe by most US Extension services for raised-bed construction, optionally with a plastic liner between wood and soil.

Sketch your raised bed dimensions and orientation in Growli and the app calculates the soil volume to order, suggests crops that thrive in raised beds and your climate zone, and schedules planting reminders by frost date. For season-1 setup, Growli walks you through the pest-barrier checklist (hardware cloth for voles, copper tape for slugs, insect mesh for cabbage white) and irrigation planning. As you log harvests, Growli builds a crop history that drives next-year rotation suggestions to avoid pest and disease buildup.

Start seeds indoors 6-8 weeks before your last spring frost date for most warm-season crops — tomatoes, peppers, eggplant. Brassicas and lettuce go 4-6 weeks before last frost; onions and leeks 8-10 weeks. Find your last frost date for your US zip code or UK postcode and count back. The most common mistake is starting too early — over-grown seedlings transplant worse than ones started on schedule.

Start indoors any heat-loving or slow-growing transplant: tomatoes, peppers, eggplant, herbs (basil, parsley, oregano), brassicas (cabbage, broccoli, kale, Brussels sprouts), lettuce, onions, leeks, and flowers like petunias and snapdragons. Skip indoor starting for root crops (carrots, radishes, beets) — they fork if transplanted. Direct-sow beans, peas, corn, cucumbers, squash, melons, spinach, and cilantro outside in cool soil.

Yes, in almost all cases. A sunny south-facing window provides 2-3 hours of usable light per day; seedlings need 14-16. Without supplemental light, seedlings stretch toward the window and become leggy, weak, and prone to falling over. A basic $20-40 LED grow light, kept 5-10 cm above the seedlings on a timer, is the single biggest upgrade you can make for stronger transplants.

Most vegetable and herb seeds germinate in 5-14 days at the right soil temperature. Tomatoes germinate in 5-10 days at 21-24°C (70-75°F). Peppers and eggplant are slower — 10-14 days. Brassicas and lettuce germinate in 5-7 days in cooler soil. Anything taking more than 21 days has usually failed and is worth re-sowing.

Most warm-season vegetable seeds (tomatoes, peppers, eggplant) germinate fastest at 21-24°C (70-75°F) soil temperature. Cool-season crops (lettuce, brassicas, spinach) prefer 15-21°C (60-70°F). A heat mat under the tray maintains the warm range without heating the entire room and speeds tomato and pepper germination by 2-3 times. Remove the heat mat once seedlings emerge — high heat after germination causes leggy stems.

Leggy seedlings — long thin stems that fall over — are almost always caused by too little light. The seedling stretches to find more, weakening the stem. Fix it by moving a grow light to within 5-10 cm of the leaves and running it 14-16 hours a day. Tomatoes can be planted deeply at transplant to bury the leggy stem (they root from it), but peppers, basil, and most other crops do not recover from severe legginess — keep the light close from day one.

Yes — a clear plastic humidity dome keeps surface moisture in and dramatically improves germination rates. Use the dome from sowing until the first green sprouts emerge through the soil. Then remove it immediately. Leaving the dome on after germination causes damping off — a fungal disease where seedlings flop over with a pinched stem at the soil line.

Bottom-water every 2-4 days, depending on indoor temperature and airflow. Lift the tray — light = needs water, heavy = wait. Pour water into the tray below the cells, let it wick up for 15-20 minutes, then drain any excess. Bottom watering keeps the soil surface dry, which prevents damping off and fungus gnats while encouraging deeper roots. Never let trays sit in standing water for more than 30 minutes.

Add each variety to Growli with your sowing date. The app calculates the right transplant window tied to your last-frost date, sets reminders for thinning, potting up, hardening off, and transplanting, and tracks germination success across varieties so you know what to repeat next year. The seedling-stage diagnostic also flags damping off, legginess, and nutrient deficiency from a photo before the seedling fails.

Start seeds indoors 6-8 weeks before your last spring frost date for most warm-season crops — tomatoes, peppers, aubergines. Southern England sows in mid-March; the Midlands and Wales in late March; northern England and Scotland in early April. Brassicas and lettuce go 4-6 weeks before last frost; onions and leeks 8-10 weeks. The most common UK mistake is sowing too early — over-grown seedlings transplant worse than ones started on schedule.

Start indoors any heat-loving or slow-growing transplant: tomatoes, peppers, aubergines, herbs (basil, parsley, oregano), brassicas (cabbage, broccoli, kale, Brussels sprouts), lettuce, leeks, onions from seed, celery, celeriac, and bedding flowers like petunias and snapdragons. Skip indoor starting for root crops (carrots, radishes, beetroot) — they fork if transplanted. Direct-sow broad beans, runner beans, peas, courgettes, squash, spinach, and coriander outside in cool soil from late March.

Useful but not essential. A heated propagator maintains 18-21°C compost temperature, which speeds tomato, pepper, and aubergine germination by 2-3 times. UK central heating cycles on and off, so unheated windowsill compost can drop into the low teens overnight, slowing germination. A 12-inch electric propagator costs £25-40 from Wickes, B&Q, or Garland Products. Without one, expect 10-14 days for tomato germination versus 5-7 days with one.

Yes, in almost all cases. A sunny south-facing UK window in March provides 3-4 hours of usable light per day; seedlings need 14-16. Without supplemental light, seedlings stretch toward the window and become leggy, weak, and prone to falling over. A basic £20-40 LED grow light, kept 5-10 cm above the seedlings on a timer, is the single biggest upgrade you can make for stronger UK transplants — especially for anyone north of Birmingham.

Most vegetable and herb seeds germinate in 5-14 days at the right compost temperature. Tomatoes germinate in 5-10 days at 18-21°C. Peppers and aubergines are slower — 10-14 days. Brassicas and lettuce germinate in 5-7 days in cooler soil. UK winter and early spring germination is often slower than seed packets suggest because compost cools overnight — a heated propagator closes the gap.

Most warm-season vegetable seeds (tomatoes, peppers, aubergines) germinate fastest at 18-21°C compost temperature — a heated propagator delivers this reliably in UK homes. Cool-season crops (lettuce, brassicas, spinach) prefer 15-18°C. Remove the heat once seedlings emerge — high temperatures after germination cause leggy stems. UK kitchen worktops and unheated bedroom windowsills often sit at 15-17°C in March, too cool for tomato germination without a propagator.

Yes for cool-season crops like brassicas and lettuce sown from late March onwards, when UK daylight is long enough. For warm-season heat-lovers (tomatoes, peppers, aubergines) sown in March, expect leggy seedlings without a grow light. The compromise: sow a fortnight later (late March instead of mid-March), pot up larger seedlings to absorb the legginess, and bury tomatoes deep at transplant. North-facing-only homes really need a grow bulb.

Leggy seedlings — long thin stems that fall over — are almost always caused by too little light, which is a chronic UK March-April problem. The seedling stretches to find more, weakening the stem. Fix it by moving a grow light to within 5-10 cm of the leaves and running it 14-16 hours a day. Tomatoes can be planted deeply at transplant to bury the leggy stem (they root from it), but peppers, basil, and most other crops do not recover from severe legginess.

Add each variety to Growli with your sowing date and UK postcode. The app calculates the right transplant window tied to your specific last-frost date from Met Office data, sets reminders for thinning, potting up, hardening off, and transplanting, and tracks germination success across varieties so you know what to repeat next year. The seedling-stage diagnostic also flags damping off, legginess, and nutrient deficiency from a photo before the seedling fails.

Match the interval to the crop's days to maturity. Fast crops (radish, salad leaves) every 10 to 14 days; medium crops (lettuce, bush beans, spinach) every 14 to 21 days; slower crops (carrots, beets, scallions) every 21 to 28 days. University Extension services and seed-house growing libraries broadly agree on these ranges. The single most important habit is sowing on a fixed calendar day rather than waiting for the bed to look ready.

Roughly 8 to 12 weeks before your first autumn frost — 8 weeks for fast crops like radish and salad leaves, 12 weeks for slower crops like carrots and beets that need longer to size up. Use a frost date calculator to find your first-frost date, then count back by the crop's days to maturity plus a two-week buffer for slower autumn growth. Cool-season crops also get a second window: pause through midsummer heat and resume in late summer for an autumn harvest.

Indeterminate (vine) tomatoes, winter squash and pumpkins, garlic, maincrop potatoes, leeks, parsnips, Brussels sprouts, sweet potatoes, and perennials like asparagus and rhubarb. These either crop continuously from a single planting or take so long to mature that a second sowing never finishes before the season ends. For long-season crops, use variety succession instead — sow early, mid, and late varieties on one date so the harvest still spreads.

Succession planting spreads one crop's harvest across a season by staggered sowing within the same year. Crop rotation moves plant families to different beds across years to prevent soil-borne pest and disease buildup. They work together: succession maximises within-season yield, rotation protects the soil over multiple seasons. See the vegetable garden layout guide for the rotation framework.

Yes — succession works especially well in raised beds and containers because the small batch sizes suit limited space. Sow a quarter-row or a single container of lettuce every two weeks rather than filling everything at once. The fast turnover of radish and salad leaves makes them ideal container succession crops. See the container vegetable gardening and raised bed guides for the spacing details.

Two common causes. First, the sowings were too close together (under 10 days) so they effectively matured together — widen the interval. Second, a midsummer heat spike forced several staggered sowings to bolt simultaneously regardless of sowing date. In hot zones, switch to bolt-resistant summer varieties, provide afternoon shade, or accept a midsummer pause and resume in late summer.

Tell Growli your location and which crops you want to grow, and the app builds a staggered sowing calendar around your last and first frost dates — the right interval for each crop, the season window for each, and reminders on every sowing day. As you log what you sow, Growli tracks the schedule so you never lose track of which batch was sown when, and suggests a replacement crop the moment a batch is cleared.

The best layout puts tall crops (tomatoes, corn, pole beans) on the north side so they do not shade shorter crops, groups water-needy crops together for efficient irrigation, rotates plant families every year, and leaves 18 to 24 inches between rows for access and airflow. A 4 by 8 foot raised bed is the simplest format for a first vegetable garden — large enough for a meaningful harvest, small enough to reach every plant without stepping on soil.

Run rows east to west so the tallest plants on the north end do not shade shorter plants. For raised beds with a 3 to 4 foot width, the orientation matters less because you reach in from both sides, but always still place tall crops on the north edge of the bed. Avoid running rows north to south unless your plot is in deep shade from a building to the south already.

Tomatoes with basil, carrots with onions or leeks, brassicas with dill, the classic Three Sisters of corn, pole beans, and squash, and any vegetable with French marigolds for nematode control. Avoid pairing tomatoes with brassicas, onion family with beans or peas, and fennel with most edibles.

Crop rotation moves plant families to a different spot each year on a 3 or 4-year cycle to break pest and disease cycles and balance soil nutrition. The simplest 4-year version rotates leafy brassicas, then tomato-family fruit crops, then roots, then nitrogen-fixing legumes, returning to brassicas in year 5. Plants in the same family share pests and diseases, so keeping them apart in time prevents buildup.

A single 4 by 8 foot raised bed (32 square feet) is the right starting size for one or two adults. It produces enough tomatoes, herbs, salads, and a few peppers to be worth the effort, but small enough to manage in 30 minutes a week. Most beginners who go bigger in year one end up overwhelmed by weeding and watering in mid-July and abandon the plot by August.

Leave 18 to 24 inches between rows for most crops. Wider for sprawling crops like courgettes, pumpkins, or indeterminate tomatoes (36 inches). Narrower (12 inches) for compact crops like lettuce, carrots, or beetroot in raised beds where you reach in rather than walking between. Within a row, follow the spacing on the seed packet — those numbers reflect each plant's mature spread.

Not without yield loss and disease buildup. Plants in the same family share pests and soil-borne diseases — planting tomatoes in the same spot three years running guarantees verticillium, fusarium, or nematode pressure by year three. Rotate families on a 3 or 4-year cycle. The only common exceptions are perennial vegetables like asparagus and rhubarb, which stay in one spot for decades.

Yes — sketch your beds in Growli, drag in the crops you want, and the app flags spacing problems, family conflicts, and sun orientation issues before you plant. It remembers the layout year to year and auto-suggests next year's rotation. You can also start from one of the sample 4 by 8, 4 by 16, or 10 by 20 ft templates and adjust.

Climbing and vining crops are the natural fit: pole and runner beans, peas, cucumbers, indeterminate tomatoes, and compact or small-fruited squash and melons on strong support. For towers and wall planters, use shallow-rooted lightweight crops — lettuce, salad leaves, spinach, herbs, strawberries, and scallions. Deep-rooted crops (carrots, parsnips) and large brassicas are not suited to vertical systems and should stay in the ground.

For suitable crops, vertical growing commonly yields roughly 4 to 10 times more produce per square metre than letting the same crop sprawl on the ground, because you reclaim the column of light and air above the bed. The exact multiple depends heavily on the crop and structure, so treat it as an order-of-magnitude benefit. Secondary gains — less disease from better airflow and easier harvest — matter nearly as much as the raw space saving.

For indeterminate (vine) tomatoes, a single stake or a dropped string with the plant pruned to one or two leaders gives the best airflow and yield and is the greenhouse and polytunnel standard. For rows of determinate tomatoes, the Florida (basket) weave is fast and efficient. If you use cages, use heavy concrete-reinforcing-mesh cages — the flimsy conical store cages collapse under a loaded indeterminate plant by late summer.

Yes, but only on rigid support — a cattle-panel (stock-panel) arch bent between two beds is the standout structure. The critical detail is supporting the heavy fruit: as each squash, melon, or mini-pumpkin sizes up, sling it in a fabric hammock tied to the structure so its weight does not snap the stem. Never attempt heavy fruiting vines on string or light netting; choose compact or small-fruited varieties for the best results.

Yes. Stacking towers and wall planters hold a small volume of soil and dry out fast and unevenly — the top slots dry first because water drains downward. Build in drip irrigation or use a tower with a central watering core from the start; reliably hand-watering a tower so the upper slots do not dry out is difficult. This watering challenge is the single most common reason tower gardens underperform.

Shallow-rooted, lightweight crops in pocket planters, hanging baskets, or tiered gutter gardens: salad leaves and lettuce, spinach, herbs (basil, parsley, chives, mint), strawberries, and tumbling or compact tomato varieties in baskets. Two cautions — small soil volume dries fast so plan watering, and wet planters are heavy, so fix systems into structural support rather than just fence cladding or render.

Yes, meaningfully. Lifting foliage and fruit off the soil increases airflow and lets leaves dry faster after rain or watering, which reduces fungal diseases like tomato blight and cucumber powdery mildew and limits soil-splash pathogens. It also makes fruit visible and reachable, so you harvest cleaner and rot less. Better light interception and the ability to grow cool-season crops in the shaded base column are further benefits.

Add your space and zone and Growli suggests which crops to grow vertically, the support strength each needs (string and netting for light vines, rigid panels for heavy fruit, towers for shallow greens), and a planting calendar around your frost dates. It flags the watering setup towers and wall planters require, and pairs base-of-trellis shade-tolerant crops for double-use of the footprint.

There's no single 'best' — it depends on the stage. At planting, a balanced 10-10-10 works. From flowering through fruiting, a high-potassium feed like Tomorite (UK), Espoma Tomato-Tone, or Miracle-Gro Tomato Plant Food (US) drives fruit set. Stick with one product per season rather than switching brands; consistency matters more than product choice.

Worm castings, compost, and fish emulsion are the reliable three. Worm castings mixed into the planting hole + monthly top-dress provide gentle slow-release feeding. Compost tea (mature compost steeped in water 24-48 hours, diluted 10:1) feeds and inoculates the soil. Fish emulsion is the strongest organic option — dilute per pack and apply every 2-3 weeks during fruiting.

Container tomatoes need synthetic or fast-acting organic — container soil has no microbiome to break down slow-release organic over time. Miracle-Gro Tomato Plant Food (US) or Tomorite (UK), applied every 7-10 days at full pack strength, is the standard. Switch to the higher-K formula once flowers appear.

High-potassium liquid feed (the K number on the NPK label should be the highest). Look for 5-10-10, 4-7-10, or 3-4-6 organic. Apply every 7-14 days from first flower until 2 weeks before final harvest. Container plants need the 7-day end; in-ground can stretch to 14.

Granular slow-release like Vitax Q4 (UK) or Espoma Tomato-Tone (US) worked into the bed at planting + monthly side-dressing through the season. Raised beds have better soil reserves than containers but less than in-ground gardens, so the moderate slow-release approach works best.

Tomorite (4-3-8), Chempak Tomato Food (11-9-30), Espoma Tomato-Tone (3-4-6), and Maxicrop Tomato Feed are all high-K relative to N. The 'K' is the third number in the NPK ratio — anything where the third number is the highest qualifies. Avoid 'all-purpose' garden feeds during fruiting; their N is usually too high.

A water-soluble high-K feed applied weekly at half-to-full pack strength. Tomorite is the UK standard; Miracle-Gro Tomato Plant Food is the US standard. Both are formulated for the high-frequency feeding container tomatoes need. Skip the granular slow-release in containers — it doesn't break down predictably in limited soil.

Add your tomato variety, your container or in-ground setup, and your region to Growli. Growli recommends a specific product (with brand names available in your country), the dilution rate, and the application frequency tied to your local frost-date and flowering observations. Growli also flags symptoms in your photos that suggest you should switch product or dial back.

At transplant, when you move them from indoors to their final outdoor or container spot. A light balanced feed (10-10-10 granular, half-strength liquid, or compost worked into the hole) carries them through the first 2-3 weeks. Don't fertilize seedlings before transplant — it produces leggy plants.

Only after the first true leaves appear (the second set of leaves, not the seed leaves), and only with a quarter-strength balanced feed every 7-10 days. Heavy fertilizing of seedlings produces tall weak stems. Most gardeners skip seedling fertilizing entirely if using fresh seed-starting mix.

Two weeks before your last expected harvest. The plant uses what's already in the soil for the final ripening, and added nitrogen at this stage delays ripening and produces softer fruit. Mark your local first-frost date and count back 2 weeks from the final harvest you expect.

Wait 10-14 days after transplant before the next feeding. The starter feed in the planting hole carries through this period. After that, switch to your regular schedule — high-potassium feed every 1-2 weeks once flowers appear.

Same as above — 10-14 days after transplant if you used a starter feed in the hole. If you didn't add anything at transplant, feed lightly 5-7 days after to help root establishment. Use half-strength to avoid root burn on young plants.

Use a high-potassium liquid feed every 7-14 days. Brand names: Tomorite (UK), Espoma Tomato-Tone (US), Miracle-Gro Tomato Plant Food. Water it in at the base of the plant, not on the leaves. Container tomatoes need the more frequent end of that range; in-ground can stretch to 14 days.

A balanced 10-10-10 granular or a half-strength liquid 10-10-10 worked into the planting hole. Compost or well-rotted manure mixed in the hole also works. Avoid high-nitrogen fertilizer at this stage — you want roots to establish before the plant pushes leafy growth.

Set your variety and location in Growli and it ties the fertilizer schedule to your local last-frost date, transplant date, and expected harvest window. The first reminder fires at transplant, then on flowering, then every 7-14 days adjusted for whether you're in a container or in-ground.

Plant garlic in fall, 4-6 weeks before your first hard frost, for harvest the following summer. That's mid-September in US zones 3-4, late September to mid-October in zones 5-7, late October to November in zones 8-9, and around mid-October across most of the UK. Cloves need 4-6 weeks to establish roots before winter dormancy — that root mass determines next summer's bulb size.

The best time is 4-6 weeks before your first hard frost, when soil is still workable but cooling below 15°C (60°F). For most US gardeners that's October; for UK gardeners it's mid-October. Plant too early and the green tops emerge and get frost-damaged; plant too late and roots don't establish before the ground freezes, producing small bulbs next year.

Plant in fall, 4-6 weeks before first hard frost. Break bulbs into cloves on planting day (keeping papery wrappers on). Plant the largest cloves pointed-end up, 2 inches deep in mild zones or 4 inches in cold zones, spaced 6 inches apart. Mulch with 3-4 inches of straw after the first hard frost. Don't water through winter. Harvest the following June or July.

Plant garlic bulbs — broken into individual cloves — in fall, 4-6 weeks before your first expected hard frost. Don't plant whole bulbs; separate them into cloves the day of planting so they don't dry out. Each clove produces one new bulb of 6-12 cloves the following summer. Use only seed garlic from a nursery, not supermarket bulbs (often treated with sprout inhibitors).

Ohio spans US zones 5b-6b. Plant garlic in the first three weeks of October across most of the state — early October in northern Ohio (Cleveland, Toledo) and mid- to late October in southern Ohio (Cincinnati, Columbus suburbs). Mulch heavily with straw after Halloween. Hardneck varieties like Music and German Extra Hardy do best in Ohio's winters.

Michigan is mostly zones 5-6, with the Upper Peninsula in zones 3-4. Plant late September through mid-October across the Lower Peninsula; plant mid- to late September in the UP. Mulch with 4-6 inches of straw to protect against freeze-thaw cycles around Lake Michigan. Hardneck varieties are the right call across the state.

Pennsylvania spans zones 5b-7a. In western PA and the Allegheny highlands plant early to mid-October; in central PA mid- to late October; in southeastern PA (Philadelphia area) late October to early November. Aim for soil temperatures around 10°C (50°F) at planting depth. Hardneck varieties suit most of Pennsylvania.

Texas covers zones 7-10, so timing varies. Panhandle and north Texas (zone 7): plant late October. Central and east Texas (zones 8-9): plant in November. South Texas (zones 9-10): plant in late November or early December using pre-chilled cloves (refrigerate 6-8 weeks before planting). Softneck varieties like Inchelium Red and California Early do best in Texas heat.

Garlic planted in fall is harvested the following summer, typically late June through July depending on region. The signal: the bottom 3-4 leaves have yellowed and dried, but the top 5-6 leaves are still green. Each green leaf equals one wrapper layer on the bulb. US zones 6-7 harvest late June; zones 8-9 mid-June; zones 3-5 and UK mid- to late July.

Garlic planted in October is ready 9 months later — late June to mid-July in most US zones 5-7 and across the UK. In warmer zones 8-9, October-planted garlic finishes earlier (mid-June). Watch for the bottom 3-4 leaves to brown while top leaves stay green — that's the harvest window. Dig (don't pull) the bulbs with a fork to avoid bruising the wrappers.

Add your zip code (US) or postcode (UK) to Growli and I'll tie the garlic planting reminder to your specific first-hard-frost forecast from NOAA / Met Office data — counting back 4-6 weeks. I'll also remind you to source seed garlic in August, mulch after the first frost, snap scapes in June (if you're growing hardneck), and harvest when the leaf signals appear next summer.

Plant garlic in mid-October across most of England and Wales for harvest the following late June to mid-July. Northern England and Scotland should plant in late September to early October to give the cloves enough warm soil time before the ground cools. The Channel Islands, Cornwall, and south Devon can plant from mid-October through early November in milder years. A second window opens in late February to early March for spring-planted varieties.

Not in the south. Across southern England, Wales, and Cornwall, you can plant garlic through November if the ground is still workable and not waterlogged. The bulbs will be slightly smaller than mid-October plantings but still cropworthy. In the Midlands and northern England a November planting is risky — the ground often freezes before roots establish. Scotland: switch to spring planting instead.

For southern England: Solent Wight (softneck, RHS Award of Garden Merit, stores well into spring). For northern England and Scotland: Lautrec Wight (hardneck, the UK-bred classic, big easy-to-peel cloves). Both are bred specifically for UK conditions by the Isle of Wight Garlic Farm. For a single all-round variety, Solent Wight is the easiest place to start. Avoid imported supermarket garlic — most is treated and bred for warmer climates.

Yes — plant cultivars sold for spring planting (Cristo AGM, Germidour AGM, Marco, or the dual-season Solent Wight) in late February to mid-March. Spring-planted garlic crops at about the same time as autumn-planted (mid- to late July) but produces bulbs 30-50% smaller. Use spring planting if you missed the autumn window, have heavy waterlogged clay, or live in the Scottish highlands where autumn plantings sometimes get killed by sustained sub-zero conditions.

Plant cloves pointed-end up, 5 cm deep in southern England, 8-10 cm deep in Scotland and the north. Space cloves 10-15 cm apart in rows 25-30 cm apart. Deep planting in the north protects against freeze-thaw heave that can push shallow-planted cloves out of the soil. In waterlogged clay, raise the bed rather than planting deeper — sitting in wet soil rots cloves.

Yes — mulch with 5-8 cm of straw, leaf mould, or composted bark after the first hard frost is forecast. Mulch insulates against freeze-thaw cycles (the biggest UK winter risk), suppresses weeds in the early spring growth burst, and keeps moisture even through May and June. In Cornwall, the Channel Islands, and other mild micro-climates the mulch is optional but still helpful for weed control.

Late June to mid-July across most of the UK, mid- to late July in Scotland and Northern Ireland. The signal: the bottom 3-4 leaves have yellowed and dried while the top 5-6 leaves stay green. Each green leaf equals one wrapper layer on the bulb. Dig with a fork rather than pulling (the stems can break off the bulb), then cure in a dry airy spot for 2-3 weeks before trimming and storing.

Add your postcode to Growli and the app ties the garlic planting reminder to your specific first-hard-frost forecast from Met Office data — counting back 4-6 weeks. The app also reminds you to source seed garlic in August, mulch after the first frost, snap scapes in June if you are growing hardneck, and harvest when the leaf signals appear the following July.

Outdoors: after your last expected frost — mid-March in US zone 9, late April in zone 7, mid-May in zone 5-6, late May in UK southern England, early June in UK Scotland. Indoors from seed: 6 weeks before your outdoor transplant date. Don't rush the season — cold-stressed tomato plants are stunted all summer.

Wait until two conditions are met: (1) your last expected frost date has passed, and (2) soil temperature is 15°C (60°F)+ at 4 inches deep, measured for at least 3 consecutive days. The second condition matters as much as the first. Cold soil keeps tomato roots dormant even in warm air.

Sow indoors 6 weeks before your outdoor transplant date. For US zone 6 with a May 5 last frost, that's March 24. For UK southern England with a May 25 transplant, that's mid-April. Surface-sow on moist seed-starting mix and keep at 21-27°C; germination in 5-10 days.

The best time is 1-2 weeks AFTER your last-frost date, when soil temperature has stabilised at 15-18°C. That margin protects against an unexpected late frost and ensures roots establish in warm soil. Planting exactly at the last-frost date is too aggressive — averages mean some years are colder than the chart.

Same answer as 'best time' — 1-2 weeks after your last-frost date, with soil at 15°C+, and a frost-free 10-day forecast. In US zone 7 that's around the first week of May; in UK southern England it's late May to first week of June; in US zone 9 it's late March.

6 weeks before your outdoor transplant date. The exact date varies by region — for US zone 5 (late May transplant), start seeds in mid-April. For UK southern England (late May transplant), start seeds in mid-April too. Use a heat mat to maintain soil temperature above 21°C for fastest germination.

Cover when night temperatures forecast below 5°C (40°F) for the first 2-3 weeks after transplant. Use lightweight row cover, walls-of-water, or even an old bedsheet — anything that traps soil heat. Remove covers each morning so plants get full daylight. After 3 weeks of growth, tomato plants tolerate normal night temperatures.

Add your zip code (US) or postcode (UK) to Growli and the app ties the planting reminder to your local last-frost date from NOAA / RHS data, the current 10-day weather forecast, and your specific tomato variety's days-to-maturity. The reminder fires only when all conditions check out — not on a generic chart date.

Sow indoors mid-March for southern England, late March for the Midlands, early April for northern England and Scotland. Plant out into an unheated greenhouse from late April (south) to mid-May (north). Plant out outdoors from mid- to late May in the south, early June in northern England and Scotland. Wait until night temperatures stay reliably above 10°C — a late May frost will wipe out your seedlings in one night.

Late May for the south of England and Wales; early June for the Midlands, northern England, and Scotland; mid-June for the Scottish highlands and the islands (and only under cover there). Earlier than that is a gamble — even in a warm year, one cold snap below 5°C sets the plants back a fortnight. Cornwall, the Channel Islands, and south Devon can plant out from early May in most years.

Six weeks before your planned outdoor transplant date. For southern England with a mid-May greenhouse transplant or late-May outdoor transplant, that is mid-March. For northern England and Scotland with a June transplant, sow in early April. Use a heated propagator or a warm south-facing windowsill at 18-21°C — tomato seeds germinate poorly under 16°C.

Not safely, except in a very few mild micro-climates (Channel Islands, west Cornwall, south Devon coast). Across the rest of the UK, April nights routinely drop below 5°C and a late frost in the first three weeks of May is normal. Plant out into an unheated greenhouse from late April, or into a polytunnel slightly earlier, but hold outdoor transplants until at least mid-May in the south.

From sowing to first ripe tomato is roughly 14-16 weeks for an early variety in a greenhouse, 16-20 weeks outdoors. A mid-March indoor sowing gives a first harvest from late July onwards in a greenhouse, mid-August outdoors. The British growing season runs out in October — pick green fruit at the first hint of colour from late August and ripen on a sunny windowsill.

Two to three weeks earlier than outdoors. Southern England can plant into an unheated greenhouse from late April; the Midlands from early May; northern England and Scotland from mid- to late May. A heated greenhouse with a minimum 10°C night temperature can plant out in early to mid-April anywhere in the UK. Ventilate aggressively on warm days to discourage blight.

Outdoor planting should be complete by the third week of June anywhere south of Edinburgh, otherwise the fruit will not ripen before the autumn cold sets in. Greenhouse planting can extend to early July with short-season varieties (Glacier and Tumbling Tom are the most reliable UK options). After early July, switch to buying mature transplants or wait for next season.

Add your postcode to Growli and the app ties the tomato planting reminder to your specific last-frost date from Met Office historical data, the live 10-day forecast, your chosen variety's days to maturity, and whether you are growing under cover. The reminder only fires when all conditions check out, not on a generic chart date — so a cold April will push your reminder a fortnight later than the chart says.

Yes, in USDA zone 7 and warmer and across most of the UK, with protection in colder zones. The key is that you are mostly maintaining a harvestable larder rather than growing actively — autumn-established hardy crops (spinach, kale, mache, leeks, parsnips) are held alive and unfrozen through the dark months by a cold frame, low tunnel, or polytunnel, and you pick from them through winter. Active growth resumes as daylength increases in late winter.

A cold frame shifts the effective microclimate roughly 1.5 USDA zones warmer — about 500 miles to the south, in Eliot Coleman's phrasing — with interior night temperatures commonly 7 to 20°F (4 to 11°C) above outside air. The trade-off is daytime overheating: a sealed cold frame on a sunny winter day can exceed 86°F (30°C) and cook the crop, so ventilation whenever the day is mild is the essential cold-frame skill.

They are the same structure under different regional names — polytunnel is the UK term, high tunnel the US term. Both are walk-in, plastic-covered, unheated structures on a steel or timber frame that gain roughly one to two USDA zones and extend the full season at both ends. A low tunnel, by contrast, is a small hoop-and-cover structure over a single bed that you cannot walk into and that gains about one zone.

The hardiest are spinach, kale, mache (corn salad), claytonia, leeks standing in the ground, and parsnips left in situ — many of which survive zone 7+ and UK winters with only fleece on the worst nights, and sweeten after frost. Winter brassicas (Savoy cabbage, purple sprouting broccoli, Brussels sprouts) stand through UK winters outdoors. Tender crops (tomatoes, beans, peppers, basil) do not survive winter even under an unheated polytunnel.

Daylength, not just cold, limits winter growth. Below roughly 10 hours of daylight — the weeks either side of midwinter, sometimes called the Persephone period — even protected crops barely grow. This is normal and expected: the plants are holding rather than growing, and you harvest from the standing larder. Active growth resumes as daylength climbs back above about 10 hours in late winter, often with a strong surge.

Late summer to early autumn in most temperate zones, so plants reach near-maturity before the low-light midwinter window. Use the backward-counting method from the fall vegetable garden guide: a plant that goes into winter small and immature will neither grow nor reliably survive. Getting the autumn sowing date right is the single biggest factor in winter-garden success — the decision is made in August and September, not December.

Much less than in summer, and carefully. Cold, wet, stagnant conditions inside a closed structure breed botrytis and root rot, which kill more overwintering crops than cold does. Water only when the soil is genuinely dry, in the morning so foliage dries before nightfall, and at the base of plants rather than over the leaves. Free-draining soil or raised beds under cover prevent winter waterlogging.

Growli flags which winter crops your zone supports outdoors with and without protection, and — critically — schedules the autumn sowing dates that must be hit for plants to reach near-maturity before the low-light midwinter window. It tracks which structures (fleece, low tunnel, cold frame, polytunnel) you have and tailors the crop list accordingly, and reminds you to ventilate on mild sunny days, the single most common winter-structure mistake.