Mint is one of the most useful herbs in the garden and one of the most aggressively invasive. Left unchecked, it sends out horizontal runners underground and can take over a bed within a single growing season. The solution is simple: always grow mint in a container, and manage it correctly so it stays productive rather than straggly.
The Container Method
The standard advice is to sink a bucket or large pot into the ground to confine the roots. This works to an extent, but runners can escape over the lip of the container and still colonise the surrounding bed. A better approach: grow mint entirely in a freestanding container that sits on a hard surface (paving, gravel, decking). No runners can escape, and you can monitor the plant easily.
Which Mint to Grow
Spearmint (Mentha spicata) is the most versatile culinary mint — the one in most mint sauces and teas. Peppermint (Mentha piperita) has a stronger, more medicinal flavour and is better for teas and mojitos. Chocolate mint has a genuine chocolate undertone and is popular in desserts and drinks. Apple mint has a mild, fruity flavour and large, woolly leaves. All are grown the same way.
Growing Conditions
Mint is one of the most adaptable herbs — it tolerates shade, average soil, and inconsistent watering better than almost any other culinary herb. It prefers moist, fertile soil and dappled shade to full sun. In very hot, sunny positions it can scorch and dry out quickly; shade keeps it lush and productive for longer. Water regularly — mint is the opposite of rosemary in this respect.
Pruning and Harvesting
Harvest mint by cutting stems back to a leaf node, removing up to half the current growth. After harvesting, the stems branch and produce two new shoots at each cut — similar to basil. Cut the plant to within 5cm of the soil in midsummer if it becomes straggly, then water and feed with a liquid fertilizer. It regrows vigorously within two to three weeks. Cut back again to 5cm in late autumn to encourage clean new growth in spring.
Keeping Container Mint Productive
Mint in containers becomes pot-bound quickly and the flavour of the leaves deteriorates as the plant gets stressed. Divide container mint every two to three years: tip the pot out, break the root ball apart, discard the central woody section, and replant the youngest outer sections in fresh compost. This resets the plant and gives you several new plants for free.
FAQ
Can I grow mint from supermarket cuttings?
Yes. Fresh mint stems from a supermarket often have viable nodes. Place the cut end in a glass of water and leave on a windowsill — roots typically appear within one to two weeks. Once rooted, pot into compost and keep well watered.
My mint flowers in summer — should I deadhead?
If you want to keep harvesting leaves, yes — deadhead or cut back the flowering stems. Mint flavour declines after flowering. However, allowing some flowers is worthwhile for pollinators, who are very attracted to mint flowers.
What is eating my mint?
Mint is largely pest-resistant, but mint flea beetles (which create small holes in leaves) and caterpillars of the mint moth are occasional problems. Neither is usually serious enough to require treatment. Aphids can colonise stressed plants — improve watering and cut back affected stems.
Can I grow mint indoors year-round?
Yes. Mint grows well on a sunny windowsill indoors. It needs consistent watering and benefits from occasional fertilizing. Indoor mint does not go dormant in winter the way outdoor mint does, so harvest can continue year-round.
Does mint repel pests?
Mint is widely credited with repelling ants, aphids, and some moths when grown nearby. The evidence is moderate — crushed mint leaves release volatile oils that are repellent, but an unpruned, undamaged plant nearby has a less dramatic effect. Growing mint as a companion is low-risk and potentially beneficial.
See also: Best Herbs for Small Raised Beds and Raised Bed Companion Planting Guide.