June garden tasks UK — strawberries, tomatoes and watering

June garden tasks UK — strawberries, tomatoes and watering

June is the month the British garden hits stride. The frost risk has passed across almost the whole UK, growth is at its annual peak, and the early harvest overlaps with the last warm-season planting. The pace is relentless — succession sowings, weekly pinch-outs on tomatoes, and the first serious watering routine of the year. This guide is the RHS-aligned UK calendar for June, split by region, with the small jobs that distinguish a healthy summer crop from one that limps to August. It follows on from the May garden tasks and leads into the July garden tasks; localise every date with the frost date calculator, and see the whole year in the garden calendar hub.

Stay on top of it: Add your postcode to Growli and the app schedules your weekly tomato pinch, watering check and harvest windows around your specific climate — so you do not lose strawberries to birds or broad beans to blackfly.

June climate snapshot — the UK regions

By June the regional gap narrows but does not close. The south coast sees long settled spells; Scotland still gets the odd cool night below 5°C.

The risk profile flips in June. May was about frost; June is about heat-and-water stress on container plants, plus the first blackfly and slug outbreaks on tender new growth. The Met Office five-day forecast is the practical planning window — water deeply ahead of dry spells rather than reacting to wilted plants.

Sow this month — direct outdoors

June is the second-best UK sowing month after April. The soil is warm, day length is at its annual peak, and there is still time for a full crop before autumn.

Vegetables to direct-sow in June:

• French beans (dwarf and climbing) — main sowing window. Crop from mid-August.
• Runner beans — last realistic sowing for full UK summer cropping; choose Polestar or Painted Lady.
• Courgettes, marrows, squash — direct-sow if you missed the May indoor window.
• Sweetcorn — last sowing window, in blocks of 16+ for wind pollination.
• Beetroot — keep succession-sowing every fortnight.
• Carrots — sow Autumn King or maincrop varieties for October pulling. Fleece against carrot fly.
• Salad leaves (succession) — sow every 10-14 days; choose heat-tolerant varieties (Cervanek, Little Gem, Lollo Rosso).
• Lettuce — once temperatures top 25°C lettuce bolts; switch to bolt-resistant varieties or chicory.
• Peas (late June) — choose early varieties (Hurst Greenshaft, Kelvedon Wonder) for September cropping.
• Florence fennel — sow direct from late June; will not bolt in cool UK summers.
• Swiss chard, perpetual spinach — sow now for autumn and overwintering picking.
• Spring onions, radishes — keep succession-sowing.

Plant out from indoor sowings:

• Leeks — plant out pencil-thick seedlings from May sowings into 15 cm holes, water in and let the soil collapse around the stems.
• Brassicas (winter cabbage, sprouting broccoli, kale, Brussels sprouts) — net immediately against cabbage white butterflies and pigeons.
• Celery, celeriac — plant out after harden-off.

The RHS notes that this is also "fantastic for sowing salad rocket, oriental leaves, spinach and collards" — the second-spring window before midsummer heat slows brassica germination.

Tomato care — the weekly June routine

Tomatoes are the headline UK June crop. The plants double in size every fortnight under good June conditions, and what you do this month sets the August yield.

Weekly tomato tasks:

1. Pinch out side shoots on cordon (indeterminate) varieties — the small shoots that emerge in the V between the main stem and a leaf. Snap them off with finger and thumb when they are still 3-5 cm long. Bush (determinate) varieties — Tumbling Tom, Roma, Crimson Crush — do not get pinched.
2. Tie in the main stem to the cane or string support every 30 cm of growth. Use soft jute or tomato clips, never wire.
3. Water deeply twice a week, not lightly every day. Aim for 2-3 litres per established plant per watering. Irregular watering causes blossom-end rot and split fruit — the RHS specifically warns about this.
4. Feed once flowers open with a high-potassium tomato feed (Tomorite or equivalent) weekly. Feed at half-strength for the first two weeks after first flower.
5. Ventilate greenhouses aggressively on days above 22°C. Stagnant warm humid air is what triggers tomato blight and tomato leaf mould (Passalora fulva).
6. Mulch with grass clippings, well-rotted compost or straw to even out soil moisture.

The growing window for tomato blight opens in late June if the weather turns warm and wet — check the BlightSpy forecast service (run by the Fight Against Blight project) for confirmed cases in your region. For the full UK tomato growing schedule see how to grow tomatoes — UK complete guide.

Strawberries and soft fruit

June is strawberry month across the whole UK. The first ripe berries appear in southern gardens from late May and the main harvest runs through the second half of June.

• Net beds before the first berry colours — blackbirds, thrushes and starlings will strip a row in a single morning. Use 12 mm garden netting suspended on canes, never draped (small birds get tangled and die).
• Tuck straw or strawberry mats under the fruit to keep berries off the soil and prevent botrytis grey mould.
• Pick every 2-3 days as fruit ripens. Berries that touch the ground rot fast in damp June weather.
• Remove runners from cropping plants to direct energy into fruit; peg the strongest 2-3 runners per parent into pots for next year's plants if you want to renew the bed.

Other June soft-fruit jobs:

• Gooseberries — watch for gooseberry sawfly larvae stripping leaves from late May; pick off by hand or apply pyrethrum if severe.
• Raspberries (summer-fruiting) — first cropping in late June. Net against birds.
• Currants — net redcurrants, blackcurrants and whitecurrants.

Maintain — pruning, watering and feeding

• Mow weekly at 4 cm; collect clippings for compost or mulch.
• Water deeply rather than often — once or twice a week soaking 20 cm down, not light daily sprinkles that train roots to stay shallow.
• Tie in climbers — clematis, climbing roses, sweet peas, runner beans all need support as they accelerate.
• Chelsea chop (if you missed it in May) — late May is the textbook window but early June still works for hylotelephium, asters and phlox.
• Deadhead roses and bedding weekly to extend flowering.
• Trim spring-flowering hedges (privet, beech) for the first time of the year, ideally on a dull day.
• Feed flowering containers with a balanced liquid feed weekly from mid-June.
• Prune spring-flowering shrubs — philadelphus, weigela, deutzia immediately after flowering.
• Pinch out broad bean tops if you have not already; this redirects energy to pod-filling and discourages blackfly.

Pest and disease watch — UK June

The June pest list is the UK gardener's busiest:

• Blackfly on broad beans — overwintered colonies explode on tender tips. Pinch the growing tip out (this also boosts the crop) and squash any colonies. Ladybird and hoverfly larvae usually clear the rest by late June.
• Whitefly on brassicas — cover seedlings with insect-proof mesh; introduce Encarsia formosa in greenhouses.
• Slugs and snails — second peak of the year on courgettes, beans, dahlias, hostas.
• Carrot fly — keep fleece or mesh on carrot rows.
• Lily beetle — daily hand-picking on lilies, fritillaries and Solomon's seal.
• Cabbage white butterfly — first eggs laid late June; check brassica undersides weekly and rub off egg clusters.
• Capsid bug on dahlias and chrysanthemums — distorts new leaves; rarely needs intervention.
• Gooseberry sawfly — strips leaves in days; check undersides of leaves weekly.
• Greenhouse red spider mite — appears once temperatures top 25°C inside. Damp down floors twice daily and introduce Phytoseiulus persimilis if severe.
• Powdery mildew on courgettes and peas — first signs by late June on dry plants. See powdery mildew — UK guide for the cultural fix.

For a complete UK pest reference, see aphids on plants and spider mites.

Harvest now

June is the start of the main UK harvest:

• Strawberries — peak month.
• Broad beans — pick when pods are 7-10 cm long and the beans inside are thumbnail-sized. Over-mature beans go floury.
• Peas (mangetout, sugar-snap, garden) — from autumn-sown crops; second sowings cropping by late June.
• Asparagus — stop cutting on 21 June (the longest day) to let the fern build the crown for next year.
• Early potatoes — Maris Bard, Rocket, Swift, Casablanca. Dig as soon as the flowers open; the tubers are tennis-ball-sized.
• Salad leaves — main pickings from May sowings.
• Spring cabbages — finish cropping.
• Lettuce, radish, spring onions — from succession sowings.
• First gooseberries — for cooking; dessert ripeness from late June.
• Garlic scapes (hardneck garlic only) — snap off the curly flower stalks as they appear; eat sautéed.

For the autumn garlic stash, see when to plant garlic in the UK.

Order for next month — July prep

• Strawberry runner plants for July planting — order now from Marshalls, D.T. Brown, Suttons or Sarah Raven.
• Autumn raspberry canes for bare-root October delivery.
• Sprouting broccoli, kale, winter cabbage plug plants for July transplanting if you missed the May sowing window — Crocus and Notcutts both stock.
• Spring bulbs (early order) — daffodils, crocus, alliums. Best bulb varieties sell out by August; pre-order from Sarah Raven, Crocus or Peter Nyssen.

Quick wins — five-minute June tasks

• Net the strawberry bed before the first berry colours.
• Pinch tomato side shoots every Sunday — make it a fixed weekly habit.
• Refresh the bird-bath daily; June can be parched.
• Empty saucers under containers after watering to prevent root rot.
• Cut a handful of mint, chives and parsley twice a week to keep them productive.
• Snap off rose suckers at the base before they pull energy from the named cultivar.
• Pop a kettle of boiling water over a stubborn patio weed instead of glyphosate.

Related articles

• May garden tasks UK — last month's job list
• July garden tasks UK — what comes next
• How to grow tomatoes — UK guide — full season playbook
• Powdery mildew — UK guide — for tomato and squash watch
• Aphids on plants — UK guide — for the blackfly window
• When to plant garlic in the UK — for July scape and harvest prep

Reviewed and updated by the Growli editorial team. For questions about anything here, open Growli and ask — or email hello@getgrowli.app.