Mint is the most vigorous herb you will ever grow — so vigorous, in fact, that the main skill in growing it is keeping it under control. Given a free bed it will spread by underground runners and take over within a season, which is why experienced gardeners always grow mint in a pot. Confined, it is a generous, trouble-free herb: fresh leaves for tea, desserts, salads and sauces, all summer long.
Mint takes 60–90 days to reach full size, but you can start picking within weeks of planting, and a single plant in a pot will supply a household all season. It is hardy, shade-tolerant, and happy in damp soil where other herbs sulk. This guide covers growing mint in a pot (the only sane way), watering, picking for bushy growth, and keeping it from escaping.
Mint at a glance
| Growing factor | What this crop needs |
|---|---|
| Sun | part shade |
| Soil pH | 6.0–7.0 |
| Days to germination | 10–16 |
| Days to maturity | 60–90 |
| Spacing | 18–24 inches |
| Water needs | moderate |
| Cold tolerance | hardy |
| Family | Lamiaceae |
Starting seeds
Mint can be started indoors or sown directly, and which you choose depends on your season. Indoor sowing gives you a head start in cold zones; direct sowing is simpler and avoids transplant shock. Either way, germination takes 10–16 days in warm, moist soil. Our seed-starting calculator can work out indoor sowing dates, and the seed-spacing calculator works out how many seeds you need for your bed.
This is a hardy crop, so it suits the cool parts of the year: in Zones 3–5 sow in early spring and again in late summer; in Zones 6–8 spring and autumn sowings do well, with summer sowings struggling in heat; in Zones 9–10 sow through autumn, winter and early spring; and in Zones 11–13, which are frost-free, grow it in the cooler months with afternoon shade. Check your dates with our frost-date calculator or the last-first frost lookup — and when in doubt, ask your local extension service.
Mint can be started from seed indoors or sown directly, and germination takes 10–16 days — but most gardeners grow mint from a cutting or a piece of root, which is faster and more reliable, and guarantees the variety. Seed-grown mint can be variable, so if you want a particular type — spearmint, peppermint, chocolate mint — buy a plant or take a cutting from a plant you like.
Transplanting and planting out
Harden seedlings off for a week before planting out: put them outside for a few hours a day, increasing the time and exposure, and bring them back in at night. Plant out at the final spacing of 18–24 inches apart, in holes the same depth as the pot. Water each plant in well and mulch around (not against) the stems to hold moisture. Our plant-spacing calculator shows how many plants fit your bed at 18–24-inch spacing.
Soil and feeding
Mint grows best in soil with a pH of 6.0–7.0, so test your soil before you plant — a cheap test kit tells you more than guessing ever will. Work in a little compost to improve structure, but keep the soil lean — herbs prefer soil that is not over-rich — and make sure the bed drains freely. Our soil-volume calculator and raised-bed soil calculator work out how much soil or compost your bed needs.
Feed lightly: herbs grown in soil that is too rich produce lots of soft leaf with diluted flavour. A little compost at planting time is usually enough, with at most a light feed in spring. Our fertiliser calculator works out how much to apply if your soil is genuinely poor.
Mint likes rich, moist soil with a pH of 6.0–7.0 — it is one of the few herbs that prefers damp ground, and it will grow in soil too wet for most other herbs. Dig in plenty of compost before planting, and feed lightly in spring.
Watering
Water evenly and avoid letting the soil swing between soaked and bone dry. A deep soak once or twice a week beats a daily sprinkle, because it encourages roots to grow down where the soil stays cooler and moister. Mulch helps enormously here, holding moisture and keeping the soil temperature steady. Our watering calculator gives a starting point for your bed size and soil, and the watering schedule generator can build a routine around it.
Sunlight and temperature
Give Mint part shade — a few hours of direct sun, ideally in the morning, with shade in the heat of the afternoon. Too much harsh midday sun stresses it, and in hot zones afternoon shade is what keeps it productive through summer. Our sunlight calculator can check whether your spot gets enough sun.
It is hardy and copes with cool weather and light frost. In cold zones it dies back and regrows in spring; in warm zones it grows through the year, with a little afternoon shade in the hottest weather.
Pests and diseases
The pests and diseases to watch for with Mint are aphids, spider mites and whiteflies.
Aphids cluster on tender new growth and under leaves, sucking sap and leaving sticky honeydew.
Spider mites are tiny, thrive in hot dry conditions, and leave fine webbing and speckled leaves.
Whiteflies cloud up from the undersides of leaves when disturbed.
Prevention beats cure: rotate crops so the same family does not grow in the same bed year after year, clear debris at the end of the season, and inspect the undersides of leaves weekly. Our pest identifier helper can help you name a pest from its damage, and the plant-disease checker can narrow down a leaf problem.
Companion plants
Good companions for Mint are tomatoes, peppers, marigolds and cabbage.
Tomatoes share this plant's love of sun and rich soil, and the pairing works well when both get enough space and airflow.
Peppers enjoy the same warm, sunny bed and similar watering, so they make a natural neighbour.
Marigolds are the classic companion: their roots and scent deter several soil pests, and their flowers bring in pollinators and beneficial insects.
Cabbage shares similar soil and water needs, and planting herbs nearby helps confuse the cabbage white butterfly.
Plant companions in the same bed rather than in a separate corner — that is how they do their work. Our companion-planting finder can suggest more pairings for your bed.
Harvesting
Mint is ready about 60–90 days after planting, but start picking as soon as the plant is established — regular picking keeps it bushy and productive. Pinch the tips just above a pair of leaves, and take whole stems when you want a lot: the plant regrows from the base within a week or two. Harvest in the morning, when the oils are strongest, and use the leaves fresh — mint loses flavour fast once picked.
In midsummer, cut the whole plant back by half to keep it leafy and stop it flowering — flowering makes the leaves bitter. The cut stems can be dried or frozen. In autumn, the plant dies back to the roots; in cold zones, mulch the pot or move it to a sheltered spot. In spring, divide the roots and repot with fresh compost — a mint plant in the same pot for two years becomes root-bound and loses vigour.
Common problems and fixes
| Problem | Likely cause | Fix |
|---|---|---|
| Mint takes over the bed | underground runners spread unchecked | Grow mint only in a pot or a sunk bottomless bucket. |
| Orange spots on leaves | mint rust | Remove affected leaves at once and improve airflow; do not compost them. |
| Leaves turn yellow | dry soil or root-bound pot | Water regularly and repot or divide the plant each spring. |
Mint takes over the bed
Likely cause: underground runners spread unchecked. Mint spreads by runners that run underground and pop up metres away, and once it is in a bed it is very hard to remove. The only reliable control is containment from the start: a pot, or a bottomless bucket sunk into the ground with the rim above the soil.
Orange spots on leaves
Likely cause: mint rust. Mint rust shows as orange spots on the undersides of leaves and spreads fast in damp, crowded conditions. Pick off affected leaves immediately, thin the plant for airflow, and avoid wetting the foliage.
Leaves turn yellow
Likely cause: dry soil or root-bound pot. Yellow mint leaves usually mean the plant is dry or has outgrown its pot. Mint in a pot exhausts its compost and becomes root-bound within a year, so divide and repot every spring with fresh compost.
Frequently asked questions
Should mint be grown in a pot?
Yes — always. Mint spreads by underground runners and will take over a bed within a season if planted in open ground.
How long does mint take to grow?
Mint takes 60–90 days from seed to full size, but plants grown from cuttings or root divisions establish much faster, and you can start picking within weeks of planting. Once established, a mint plant produces all season until the first frosts.
Does mint come back every year?
Yes — mint is a hardy perennial. It dies back to the roots in winter and regrows in spring.
Why is my mint plant dying?
Mint rarely dies — it usually just needs water or a bigger pot. Check that the soil is moist, that the pot drains, and that the plant is not root-bound.