How to Grow Mint Indoors | Fresh Leaves Year-Round

Mint grows well indoors when given bright light, a pot with drainage holes, consistently moist soil, and regular pruning to keep it bushy and productive.

Walking past a kitchen herb garden and grabbing a handful of mint for tea or a cocktail is one of those small luxuries that costs almost nothing once you know the setup. The good news: mint is one of the easiest herbs to bring inside, surviving the winter and producing leaves for months if you get three things right — light, water, and a pair of scissors used regularly. Here is exactly what the plant needs to thrive on your windowsill.

Light Requirements: What Mint Needs Indoors

Mint demands bright light — most sources agree on at least 4 to 6 hours of direct sun per day, though some say a minimum of 6 hours for best growth. A south-facing window is ideal; an east-facing one works well in many seasons. In intense summer sun, bright indirect light prevents leaf scorch.

If your windowsill cannot deliver enough natural light, a grow light is the practical fix. Our tested picks for the best grow lights for mint cover the setups that keep plants compact and leafy. When using artificial light, aim for 12 to 14 hours per day under a high-output LED.

The Right Pot, Soil, and Watering

Mint spreads aggressively underground, so indoors you want a container that gives roots room without letting them choke. A pot at least 8 inches in diameter works; one source recommends 8 inches deep and 12 inches wide for a generous root zone. Drainage holes are non-negotiable — mint will rot in standing water.

Fill the pot with a standard well-draining potting mix, leaving a couple of inches of headspace below the rim. Plant a seedling or cutting at the same depth it was growing in its nursery container. Water when the top inch or so feels dry, and water thoroughly until excess drains from the bottom. Always empty the saucer immediately — a pot sitting in runoff invites fungus gnats and root disease.

Pruning, Harvesting, and Preventing Flowers

The single most important maintenance habit is pruning. Pinch or snip stems regularly, cutting just above a leaf node — this forces the plant to branch and stay dense instead of growing long and leggy. Remove flower buds the moment you spot them; once mint flowers, leaf production slows and flavor changes. Harvest once stems reach 4 to 8 inches tall, taking no more than one-third of the plant at a time.

Temperature, Humidity, and Fertilizer

Mint is comfortable at typical indoor temperatures. The commonly cited range is 60 to 70°F during the day, with nighttime temperatures no lower than about 55°F. Keep the plant away from heating vents, air conditioners, and drafty windows — temperature swings stress the leaves.

Indoor air is often dry, especially in winter. Mint prefers humidity around 40 to 50 percent. A pebble tray beneath the pot or grouping plants together helps more reliably than misting, which some sources advise against since wet leaves can invite disease. Fertilize every 4 to 6 weeks during the growing season with a balanced liquid houseplant fertilizer, starting in mid-spring and tapering off in early fall.

FAQs

Why does my indoor mint look leggy and sparse?

Leggy growth is almost always caused by insufficient light or irregular harvesting. Move the pot to a brighter window, add a grow light for 12 to 14 hours daily, and start pinching stems regularly to force bushier growth.

Can I grow mint from grocery store cuttings?

Yes, as long as the stems are fresh and not wilted. Place the cuttings in a glass of water for a week or two until roots appear, then transfer them to a pot with drainage holes and potting soil.

How often should I water mint grown indoors?

Check the top inch of soil every few days. When it feels dry to the touch, water thoroughly until it drains from the bottom, then empty the saucer. Frequency varies with light and temperature — in bright, warm conditions you may water every 2 to 3 days; in cooler weather, roughly once a week.