edible gardening
How to grow mint — container, varieties, harvest guide
Grow mint in a container (it spreads aggressively in beds), in part-sun with moist soil. Cut stems above a node every 2-3 weeks for a non-stop harvest.
How to grow mint — container, varieties, harvest guide
Mint (Mentha species) is one of the easiest herbs on earth — almost too easy. Drop a sprig in moist soil and within a season it owns the bed. The Royal Horticultural Society lists mint among its "potentially invasive plants" for exactly this reason: it spreads by underground rhizomes that travel several feet a year and resprout from the smallest fragment. The trick is containment. Once you treat mint as a contained crop, it becomes a reliable, low-effort herb that thrives in conditions where Mediterranean herbs sulk.
Track your mint pruning cadence in Growli: Add the variety to the Growli app and you'll get reminders to cut stems every 2-3 weeks plus alerts when your container needs splitting.
Why mint needs a container (always)
Mint spreads two ways: by rhizomes (underground stems that travel 1-3 feet per year) and by stem cuttings that root wherever a node touches moist soil. Plant it in an open bed and within two seasons it will out-compete neighbouring herbs, vegetables, and even some perennials.
Containment options that actually work:
- Free-standing container — 12 inches wide minimum, 10 inches deep, on a hard surface (not soil). Rhizomes cannot escape over the rim if the pot sits on a paved patio.
- Sunken bucket — bury a 5-gallon bucket (drainage holes drilled) so the rim sits 2 inches above soil level. Plant mint inside. Check the rim quarterly for rhizomes escaping over the lip.
- Dedicated bed with root barrier — heavy-duty plastic root barrier sunk 18 inches deep around a small bed. Effective but expensive and high-maintenance.
What does NOT work: planting "just at the edge" of a bed, planting in a regular plant pot sunk in soil (rhizomes climb out the drainage holes), or trusting that you'll dig it out next year. By next year, it has already won.
Mint varieties — what to grow
The Mentha genus has dozens of culinary species and hundreds of cultivars. The ones worth growing at home:
| Variety | Botanical name | Flavour | Best use |
|---|---|---|---|
| Spearmint | Mentha spicata | Sweet, classic "mint" | Mojitos, tabbouleh, mint sauce |
| Peppermint | Mentha × piperita | Cool, sharp menthol | Tea, ice cream, chocolate |
| Chocolate mint | M. × piperita 'Chocolate' | Peppermint + cocoa note | Desserts, baking |
| Apple mint | Mentha suaveolens | Soft, fruity, fuzzy leaves | Garnish, fruit salads |
| Moroccan mint | M. spicata 'Moroccan' | Bright, clean spearmint | North African tea |
| Ginger mint | M. × gracilis 'Variegata' | Mild, slightly spicy | Iced drinks |
Avoid pennyroyal (Mentha pulegium) at all costs if you have pets or children — it contains pulegone, a compound the ASPCA flags as capable of causing liver failure and seizures in cats and dogs. Pennyroyal is a true mint botanically but should be kept out of any household with animals.
UK retailers — variety availability
- RHS-recommended: Crocus, Hayloft, and Sarah Raven all stock the common spearmint, Moroccan mint, and chocolate mint as 9cm pots.
- B&Q / Homebase — usually spearmint and "garden mint" (a spearmint type) in 1-litre pots from April.
US retailers — variety availability
- Burpee sells starter plants of spearmint, peppermint, chocolate mint, and Mojito mint.
- Mountain Valley Growers carries an unusually wide range including ginger mint, grapefruit mint, and Kentucky Colonel spearmint.
- Local garden centres reliably stock spearmint and peppermint from May.
Soil and sun
Mint is more forgiving than Mediterranean herbs and is happy to grow where rosemary or thyme would sulk:
- Sun: 4-6 hours direct sun ideal. Tolerates more shade than most herbs but flavour weakens in deep shade.
- Soil: Rich, moisture-retentive potting mix or garden loam with compost. Mint actually likes slightly damp ground — it grows wild along streams.
- pH: 6.0-7.0. Not fussy.
In hot southern US summers (zones 8-10), afternoon shade prevents leaf scorch. In the cooler UK and US north, full sun is fine.
Planting
Mint is rarely grown from seed — most varieties are hybrids that don't come true. Start from:
- A garden-centre transplant (the easiest and most common route).
- A cutting from a friend's plant — root a 4-inch stem in a glass of water for 7-10 days, then pot up.
- A division — split an established clump in spring or autumn.
Plant one transplant per 12-inch container. Mint fills the pot within a single season.
Watering
Mint is the thirstiest common herb. Keep the soil consistently moist but not waterlogged:
- Container mint: Water when the top inch is dry, often every 1-2 days in summer.
- In-ground mint: Water during dry spells. Mulch lightly to retain moisture.
- Indoor mint: Water 2-3 times per week. Mint signals thirst by wilting dramatically; it recovers within an hour of watering.
Drought-stressed mint produces small, bitter leaves and bolts quickly to flower.
Harvesting — cut for continuous regrowth
Mint responds to the same pinching method as basil: cut a stem above a leaf node and two new branches grow from below the cut.
Method:
- Wait until the plant is 6 inches tall and bushy.
- Find a node where two small side shoots are forming.
- Cut the stem 1/4 inch above that node with scissors or fingernails.
- Repeat every 2-3 weeks during active growth (May-October in UK/US).
Take roughly the top third each session. Never strip more than half the plant in one cut — the remaining leaves drive regrowth.
Removing flower buds extends the harvest. Once mint flowers, leaf production slows and flavour weakens. Pinch off any flower spikes you spot.
Winter care
Most common mints are hardy to USDA zone 3 / RHS hardiness rating H7 — they die back to the ground in winter and resprout from rhizomes in spring.
- Outdoor containers in cold zones: Move to a sheltered spot or sink the pot into a garden bed for winter insulation. A garage or unheated greenhouse also works.
- In-ground plants: Cut stems to 2 inches above the soil after first frost. Mulch with leaves or straw.
- Indoor winter mint: Bring a small pot inside in October. Place on the brightest windowsill. Expect leggy growth and reduced flavour through winter — supplement with a grow light if possible.
Split mint clumps every 2-3 years in early spring. The plant exhausts its potting soil quickly and the centre of the clump dies out.
Pests and problems
Mint is generally pest-resistant — the strong essential oils repel most insects. Watch for:
- Mint rust (orange pustules on leaf undersides). Remove affected leaves, improve air circulation, avoid wetting foliage. Severe cases need plant disposal.
- Powdery mildew — white powder on leaves in humid weather. Thin the plant and water at the base only.
- Spider mites on indoor mint — fine webbing and stippled leaves. Rinse foliage with water and increase humidity. See our houseplant pests guide.
- Aphids on new growth — squash by hand or spray with water. See aphids on plants.
Pet safety — mint and pets
The ASPCA classifies garden mint (Mentha species) as toxic to dogs, cats, and horses. The toxic principle is essential oils; clinical signs are vomiting and diarrhoea with large ingestions. A cat batting a mint leaf is rarely a problem. A dog eating an entire pot of fresh mint can develop GI upset.
Pennyroyal (Mentha pulegium) is significantly more dangerous — it contains pulegone, which the ASPCA notes can cause liver failure and seizures in cats and dogs. Do not grow pennyroyal where pets have access.
If a pet ingests a large quantity of any mint, call the ASPCA Animal Poison Control Center at (888) 426-4435 or contact your vet.
Companion planting
Mint's strong scent confuses several common garden pests. Planted in containers near (not in) vegetable beds it can help reduce aphid and flea beetle pressure on cabbages, broccoli, and kale. Mint also attracts beneficial pollinators when allowed to flower — bees, hoverflies, and parasitic wasps that prey on garden pests.
What mint should NOT be planted near: any other Lamiaceae herb in the same container (rosemary, thyme, oregano, sage) — mint's water needs are completely different, and it will out-compete drought-loving herbs within weeks. Always grow mint in its own dedicated container.
Culinary use
Mint is one of the most versatile culinary herbs. Quick ideas:
- Spearmint: Mojitos, mint sauce for lamb, tabbouleh, mint tea.
- Peppermint: Hot peppermint tea, chocolate pairings, ice cream.
- Chocolate mint: Mojitos with cocoa, garnish for desserts.
- Apple mint: Fruit salads, summer drinks, Pimm's cup.
- Moroccan mint: Hot sweet mint tea (the classic North African preparation).
Mint freezes well in ice cube trays with water for drinks, or chopped into olive oil for cooking.
Related articles
- How to grow basil — the other essential summer herb
- How to prune basil — the same pinching method works for mint
- Types of herbs — Mediterranean vs moisture-loving vs annual
- Container vegetable gardening — pot sizing and drainage basics
- Companion planting guide — herbs that share growing conditions
Reviewed and updated by the Growli editorial team. Pet-safety claims sourced from the ASPCA Animal Poison Control Center. For questions about anything here, open Growli and ask — or email hello@getgrowli.app.
Frequently asked questions
How long does mint take to grow from a cutting?
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.
Can I grow mint in a regular garden bed?
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.
How to grow mint indoors year-round?
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.
Why is my mint wilting?
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.
How do I keep mint from taking over my garden?
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.
Is mint safe for cats and dogs?
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.
When should I harvest mint?
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.
How does Growli help me grow mint?
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.