How to grow mint indoors

Plant mint in a garden bed and it sends runners under paths, into lawns and through the crowns of its neighbours. That vigour is exactly what makes it a good indoor herb. A pot contains the spread, and the same energy that makes mint a menace outdoors makes it the rare herb that keeps producing on a windowsill through winter, in light that would stall basil or rosemary.

Start from a cutting, not a seed packet

Peppermint is a sterile hybrid, a cross between watermint and spearmint, and it essentially cannot set viable seed. One survey counted roughly 18,000 flower spikes that yielded six seeds capable of germinating.^[2] Whatever grows from a packet labelled “peppermint seed” is not peppermint. The other mints are little better behaved: they cross-pollinate so freely that seed from a good plant rarely resembles its parent.^[3]

So mint is propagated the way commercial growers do it, from a piece of an existing plant:

1. Take a 5 to 6-inch cutting from healthy new growth, cutting just below a node. Strip the leaves from the bottom 2 inches.
2. Stand it in a glass of water on the windowsill. Roots appear in about a week.
3. When the roots are an inch or two long, usually the two-week mark, plant it into pre-moistened potting mix.
4. Pinch the tip once it starts growing to force side shoots.

A supermarket pot of living mint works as cutting stock, and a single bought plant can be divided into several the day it comes home.

The pot and the soil

Mint spreads by rhizomes, so width beats depth. A wide, shallow pot gives runners room to surface as new shoots, and it is harder for a cat or an elbow to tip over. Go against the usual houseplant advice and use plastic or glazed ceramic rather than terra cotta: unglazed clay wicks moisture out of the mix, and mint is the one herb you are trying to keep damp, not dry off. An 8-inch pot suits a young plant; expect to end up at 12 to 16 inches wide as it matures.^[4] Our pick is the 8-inch Bloem Ariana, which has a self-watering grid that suits mint’s thirst.

Any decent peat- or coir-based potting mix is fine; mint is not fussy about substrate as long as water drains through it. FoxFarm Ocean Forest is our standing recommendation, and our growing media guide covers the alternatives.

One warning that comes due about a year in: mint fills a pot with rhizomes faster than any other herb. When water runs straight through, shoots crowd the rim, or growth stalls despite feeding, tip the plant out, split the root ball, and replant a section in fresh mix.^[5] The spare sections are new plants.

Light: the brightest sill you have

The old advice that mint prefers indirect light gets the emphasis wrong. Outdoors, mint grows in full sun to part shade,^[3] and indoors it wants what every herb wants: as much light as you can give it, ideally 5 to 6 hours of direct sun on a south-facing sill.^[1]

What sets mint apart is how it handles less. Peppermint stays productive on as little as three hours of direct sun,^[4] which makes mint the herb to pick for an east or west window that would starve basil. Growth slows and stems stretch as light drops, so if the plant turns leggy and pale, light is the first suspect.

Under grow lights, run 8 to 10 hours a day as a supplement or 12 to 16 as the sole source.^[6] Our indoor lighting guide covers fixtures and distances.

Temperature and humidity

Mint does best at ordinary room temperature: 65 to 70°F in the day, around ten degrees cooler at night.^[4] Keep it out of cold drafts and off sills directly above radiators, which cook the shallow rhizomes and dry the pot twice as fast.

Dry winter air is more of a nuisance than a threat. Grouping pots raises the humidity around all of them; leave a little space between plants so air still moves.

Watering and feeding

Both of mint’s parents grow on European streamsides, watermint with its feet practically in the water,^[4] and the preference carried through: mint wants consistently damp soil and sulks in a dry pot long before most herbs notice. Water when the surface has just barely dried. Damp is the target, not waterlogged; a pot with no drainage or a saucer that never empties invites root rot.

The old rule that mint never needs feeding is a garden rule, and it fails in a pot, where every watering carries nutrients out of the drainage holes. Feed container mint a liquid fertilizer at half the label strength about every six weeks indoors.^[1] Resist the urge to double it: heavy nitrogen pushes lush growth with diluted oils, which is how you get a big plant that tastes like lawn.

Pinching and harvest

Harvest indoors is continuous rather than seasonal. Pick shoot tips regularly, a few inches at a time, cutting just above a leaf pair so two new shoots replace each one taken.^[5] Keep the total to about a third of the plant at any one time and it will not miss a step. The 2-to-3-harvests-a-year figure you see elsewhere describes field mint cut to the ground before bloom;^[3] a windowsill plant treated that way spends most of its life recovering.

Pinch out flower buds whenever they appear. Once mint commits to flowering, leaf production drops, and the plant’s energy goes to a bloom you did not want.

The mints worth growing

Britannica puts the genus at about 25 species,^[7] and the “thousands of varieties” figure that circulates is a mangled statistic; it belongs to the whole mint family, which spans more than 7,000 species from basil to lavender. For a windowsill, five are worth knowing:

Variety	Species	Character	Best for
Peppermint	Mentha × piperita	The icy one	Tea, syrups, chocolate desserts
Spearmint	M. spicata	Sweet, warm, gentle	Mojitos, lamb, tabbouleh, tzatziki
Apple mint	M. suaveolens	Fuzzy leaves, soft fruity flavour	Infused water, jellies, fruit salads
Pineapple mint	M. suaveolens ‘Variegata’	Cream-edged apple mint sport	Ornamental first, garnish second
Orange mint	M. × piperita f. citrata	Citrus over lavender	Cocktails, perfumed desserts

The chemistry behind the first two rows decides how you cook with them. Peppermint oil runs 30 to 55 percent menthol,^[8] which is the compound that reads as cold. Spearmint carries almost no menthol; its signature is carvone, typically half to two-thirds of the oil.^[9] That is why peppermint dominates tea and dessert work while spearmint, sold simply as “mint” in most supermarkets, is the one for savoury dishes and drinks.

A note on names, because seed sellers and plant tags get these wrong constantly: apple mint is M. suaveolens (you will still see the outdated M. rotundifolia on labels), pineapple mint is its variegated cultivar, and orange mint, also sold as bergamot mint or eau-de-cologne mint, is a form of peppermint.^[10]

What mint is actually good for

In the kitchen, mint carries cold drinks, lamb, grain salads and yogurt sauces, and a live plant means a sprig is always the same distance as the kettle.

On the medicinal side, the honest picture is narrower than the folklore but not empty, and the good evidence concerns concentrated peppermint oil rather than tea. Enteric-coated peppermint oil capsules are among the better-studied remedies for irritable bowel syndrome: a 2019 meta-analysis of twelve trials found them roughly twice as likely as placebo to improve global symptoms.^[11] Peppermint oil solution applied to the temples has evidence, rated limited, for easing tension headache.^[12] Claims beyond that, fighting infection, clearing sinuses, inhibiting tumours, do not survive contact with the literature and you will not find them here. Tea remains a fine reason to grow the plant; just know the trials were not done on tea.

Questions & answers

Can you grow mint indoors year-round?

Yes. Mint is perennial and keeps producing through winter on a bright sill, though more slowly. Cut back on water as growth slows, keep the mix just damp, and supplement with a grow light on 12 to 16 hour days if the plant stretches. A leggy phase in January is normal and fixes itself in spring.

Does mint need direct sunlight?

Ideally 5 to 6 hours a day, and growth is fastest with more. But mint is the most shade-tolerant of the common herbs and stays usable on around three hours of direct sun, which is why it is the standard recommendation for east and west windows.

Why is my indoor mint dying?

Check three things in order. First the pot: bone-dry mix kills mint faster than any other herb, and a saucer that never drains rots it. Second the light: pale, stretched stems mean too little. Third the roots: a plant that wilts despite watering is usually root-bound, and needs dividing into fresh mix. Our guide to why indoor herbs die covers the full checklist.

Does a mint plant repel pests?

No. The repellency studies behind that claim used extracted essential oil applied to skin or surfaces, not a living plant, and there is no evidence a potted mint deters mosquitoes, mice, ants or anything else at room range.^[13] Mint itself picks up aphids and spider mites indoors, so check it with the same suspicion as any other houseplant.

When should I repot mint?

When water runs straight through the pot, shoots crowd the rim, or growth stalls despite feeding. Indoors that arrives roughly yearly. Split the root ball and replant a section in fresh mix rather than moving the whole congested mass up a size; mint regrows from a fragment without complaint.

Is mint invasive in a pot?

A pot is the containment. Runners cannot cross a rim, which is precisely why growing mint in containers, indoors or out, is the standard advice. The one caution: never plant a pot-bound mint out into a bed to “give it more room” unless you want it in the lawn by August.

Mint has relatives worth growing for other reasons. Catnip is in the same family and just as vigorous in a pot, and both appear in our roundup of the most aromatic herbs. If your window is dark, mint is also the most shade-tolerant option among the herbs for low light.

References

1. University of Minnesota Extension. Growing herbs in home gardens. Container herbs indoors: liquid fertilizer at half the recommended strength every six weeks. https://extension.umn.edu/vegetables/growing-herbs ↩︎ ↩︎ ↩︎

2. Smithsonian Environmental Research Center, NEMESIS database. Mentha × piperita species summary, citing seed-set counts in naturalized peppermint. https://invasions.si.edu/nemesis/chesreport/species_summary/mentha%20x%20piperita ↩︎

3. Utah State University Extension. Mint in the Garden. https://extension.usu.edu/yardandgarden/research/mint-in-the-garden ↩︎ ↩︎ ↩︎

4. North Carolina State Extension Plant Toolbox. Mentha × piperita. https://plants.ces.ncsu.edu/plants/mentha-x-piperita/ ↩︎ ↩︎ ↩︎ ↩︎

5. Royal Horticultural Society. Mint: grow your own. https://www.rhs.org.uk/herbs/mint/grow-your-own ↩︎ ↩︎

6. North Carolina Cooperative Extension, Union County. Growing Herbs Indoors. https://union.ces.ncsu.edu/2021/10/growing-herbs-indoors ↩︎

7. Encyclopedia Britannica. Mint (genus Mentha) and Lamiaceae. https://www.britannica.com/plant/Mentha ↩︎

8. European Medicines Agency, HMPC assessment report on Mentha × piperita L., folium and aetheroleum: European Pharmacopoeia specification, menthol 30.0–55.0%. https://www.ema.europa.eu/en/documents/herbal-report/draft-assessment-report-mentha-x-piperita-l-folium-and-aetheroleum-revision-1_en.pdf ↩︎

9. Snoussi, M. et al. (2015). Mentha spicata essential oil: chemical composition, antioxidant and antibacterial activities. Molecules, 20(8), 14402–14424. https://doi.org/10.3390/molecules200814402 ↩︎

10. Wisconsin Horticulture, Division of Extension. Pineapple mint, Mentha suaveolens ‘Variegata’. https://hort.extension.wisc.edu/articles/pineapple-mint-mentha-suaveolens-variegata/ ↩︎

11. Alammar, N. et al. (2019). The impact of peppermint oil on the irritable bowel syndrome: a meta-analysis of the pooled clinical data. BMC Complementary and Alternative Medicine, 19, 21. https://doi.org/10.1186/s12906-018-2409-0 ↩︎

12. National Center for Complementary and Integrative Health. Peppermint Oil: Usefulness and Safety. https://www.nccih.nih.gov/health/peppermint-oil ↩︎

13. University of Maryland Extension. Mosquito repellent myths. Repellency findings come from extracted oils applied to skin, not from proximity to living plants. https://marylandgrows.umd.edu/2025/09/04/mosquito-repellent-myths/ ↩︎