Mint is the herb people regret planting more than any other, and it is also one of the most useful plants you can grow. Both things are true because of the same trait: mint spreads by underground runners, and it never stops. The question we get most about our six-variety mint pack is not "how do I grow it?" It is "how do I stop it?"
So this guide is built around containment first. Get the planting decision right in the first hour and mint becomes a five-minute-a-week plant that hands you tea, mojitos, and tabbouleh for a decade. Get it wrong and you will be pulling runners out of your strawberry bed for years.
Mint at a glance
| Factor | What mint wants |
|---|---|
| Sun | Full sun to part shade (afternoon shade in hot climates) |
| Soil | Rich, moist, well drained, pH 6.0 to 7.0 |
| Sowing depth | Surface sown, pressed in, not covered (needs light) |
| Germination | 10 to 16 days at 65 to 75 F |
| Start indoors | 8 to 10 weeks before your last frost |
| Spacing | 18 to 24 inches (it will fill the gap fast) |
| Hardiness | Perennial, roughly zones 3 to 9 depending on variety |
| Harvest | About 60 to 70 days from transplant, then continuously |
Why mint spreads, and why that decides where you plant it
Mint does not politely clump like basil or thyme. It sends out rhizomes and surface runners in every direction, and each node along a runner can root and become a new plant. In decent garden soil a single transplant can claim a 3-foot circle in one season. That is not a defect. It is the whole survival strategy of the genus Mentha, and it is why a "small patch of mint" is a temporary condition.
Once you accept that, the planting decision is simple. You are not choosing a spot for mint. You are choosing a wall for it.
Pots or beds: pick your containment strategy
Containers are the right default. A pot at least 12 inches wide and deep, with drainage holes, gives one mint plant enough root room for two to three seasons. Terracotta, plastic, a half whiskey barrel, a fabric grow bag: all fine. Keep the pot on a hard surface, not on bare soil, because mint will find the drainage holes and root straight through them into the ground. We have watched it happen on our own gravel pad in Oregon; gravel stopped it, bare dirt would not have.
The sunken pot method gets you an in-ground look with container control. Sink a 12 to 14 inch pot into the bed and leave 2 inches of rim standing above the soil line, because runners travel across the surface and will hop a buried rim. Check the pot each spring for escapees through the drainage holes, and lift and divide the plant every 2 to 3 years when it gets root-bound.
In-ground with a root barrier is for people committed to a permanent mint patch. Bury an edging barrier 18 to 24 inches deep around the bed. Shallower edging (the 4 to 6 inch lawn kind) slows mint down for about one season. A mowed grass strip at least 3 feet wide also works as a border, since regular mowing kills any runner that crosses it.
Three rules apply no matter which you choose. Never toss pulled runners into the compost, because they root there and ride the finished compost back into your garden. Shear off flower spikes if you do not want volunteer seedlings. And keep mint out of mixed herb planters entirely; it will strangle the thyme by August.
Starting mint from seed
Start seeds indoors 8 to 10 weeks before your last frost date. Mint seed is tiny and needs light to germinate, so surface sow: scatter a few seeds per cell, press them gently into moist seed-starting mix, and do not cover them. Keep the surface consistently damp with a mister and hold the tray at 65 to 75 F. Expect sprouts in 10 to 16 days, which is slower than basil, so do not panic at the one-week mark.
Here is something most guides skip, and it matters if you have grown mint from seed before: seed-grown mint is genetically variable. Mints cross-pollinate freely, and true peppermint is actually a sterile hybrid, so seed sold as peppermint produces a range of seedlings, some sharply mentholated and some closer to spearmint. In our germination trials we see this variation in every tray, and it is normal, not a bad packet. Use it to your advantage: once your seedlings are big enough to pinch, taste a leaf from each, keep the plants you like best, and multiply your favorites from cuttings. A 6-inch mint cutting roots in a glass of water in about a week, and that clone will taste identical to its parent forever.
Harden seedlings off for a week and transplant after your last frost, 18 to 24 inches apart, into whichever containment setup you chose above. If you would rather skip the indoor stage, direct sow on the soil surface after frost and keep the top quarter inch of soil moist until germination.
All six varieties in our Mint Seed Pack come individually packaged with markers, which makes the taste-and-select approach easy to track.
The six varieties, and which one you actually want
Our pack spans four true mints and two North American mint-family natives. They are not interchangeable, and knowing the differences is the difference between a tea garden and a weed patch.
| Variety | What it is | Flavor and use | Notes |
|---|---|---|---|
| Peppermint | Mentha, high menthol types | Sharp, cooling; the tea and dessert mint | Seed-grown plants vary; select your best and clone it |
| Spearmint | Mentha spicata | Sweet, mild; mojitos, tabbouleh, lamb | The best all-purpose culinary mint |
| Common mint | Spearmint-type Mentha | Classic "garden mint" flavor | The workhorse; most vigorous spreader in the pack |
| Wild mint | Mentha arvensis | Strong, rustic; teas and infusions | The North American native Mentha; extremely cold hardy |
| Mountain mint | Pycnanthemum, mint family | Minty-savory leaves | Native perennial and one of the best pollinator plants you can grow; clumps rather than runs |
| Anise hyssop | Agastache foeniculum, mint family | Licorice-sweet leaves and flowers for tea | Native, upright to 3 feet, well behaved, loved by bees |
A useful planting plan: spearmint and peppermint in pots by the kitchen door, and mountain mint plus anise hyssop out in the open garden, where their summer blooms pull in bees, hoverflies, and parasitic wasps that patrol your vegetables. The two natives are the only ones in the pack we trust outside a barrier, because they clump instead of running.
Light, water, and feeding
Mint is one of the few culinary herbs that produces well in part shade, and in zones 8 and warmer it prefers afternoon shade to full sun. Four hours of direct sun grows good mint; eight hours grows more of it but demands more water.
Water when the top inch of soil dries. Mint wants steady moisture and wilts dramatically when it misses a watering, though it usually bounces back within hours of a drink. Potted mint in summer often needs water daily; the same plant in the ground needs it maybe weekly.
Feeding is nearly optional in garden beds. For container mint, half-strength liquid fertilizer every 4 to 6 weeks during the growing season replaces what watering leaches out. Go easy: overfed mint grows lush but noticeably blander, because the aromatic oils get diluted across all that soft growth.
Troubleshooting mint
| Symptom | Likely cause | Fix |
|---|---|---|
| Leggy, sparse, floppy stems | Not enough light or never harvested | Move to more sun; cut the plant back by half to force branching |
| Orange spots under leaves | Mint rust (a fungus specific to mint) | Cut infected stems to the ground and trash them, never compost; thin for airflow |
| Leaves small, plant woody, center dying out | Root-bound pot or an aging clump | Divide in spring, replant the vigorous outer sections, refresh the soil |
| Curled, sticky new growth | Aphids | Blast off with water, then insecticidal soap if they return; see our guide to getting rid of plant pests |
| Faded, stippled leaves in hot weather | Spider mites | Rinse foliage, raise humidity, insecticidal soap on leaf undersides |
| Bland flavor | Overfeeding, deep shade, or harvesting after bloom | Cut back fertilizer, harvest before flowering |
Mint's strong oils repel most pests on their own, which is why it earns a spot near the vegetable garden even if you never brew a single cup of tea.
Harvesting: the rhythm that keeps mint productive
Start picking as soon as stems reach 6 to 8 inches, and always cut just above a leaf node, because two new stems branch from every cut. That is the whole secret to a bushy plant. In its first year, take no more than a third of the plant at once. From year two on, be ruthless: established mint can be sheared back to 2 inches above the soil two or three times a season and will regrow in about three weeks each time.
Flavor peaks just before flowering, when oil concentration in the leaves is highest, so if you are drying mint for winter tea, make your big harvest at the first sign of flower buds, in mid-morning after dew has dried. Hang bunches in a warm spot out of direct sun for a week, or freeze chopped leaves in ice cube trays with water. Dedicated tea growers usually add a straight peppermint planting just for the drying harvest.
Overwintering
In-ground mint in zones 3 to 9 needs nothing but a 2 to 3 inch mulch of straw or shredded leaves after the ground cools. The tops die back; the roots do not. Potted mint is roughly two zones more vulnerable because its roots freeze from the sides, so in zone 5 treat a potted mint like a zone 7 plant: cluster pots against the house, sink them into the ground for winter, or overwinter them in an unheated garage with a monthly splash of water. A pot brought to a sunny window in fall will keep producing modest sprigs all winter.
Quick answers
Can I grow mint indoors year-round? Yes. Give it your brightest window or a small grow light, a 10 to 12 inch pot, and steady moisture. Expect slower, leggier growth than outdoors, and pinch often.
How long until I can harvest seed-grown mint? About two months from germination to first light picking, and full production the following year. It is a perennial; year one is the investment.
Is mint invasive enough to avoid entirely? In a pot, no risk at all. In open soil without a barrier, treat the decision like planting bamboo: possible, but plan the boundary before the first root goes in.
Sources: University of Minnesota Extension, "Growing mint in home gardens"; University of California Statewide IPM Program, "Cultural tips for growing mint."
