How to Grow Herbs Indoors (All Year Round)

A pot of basil on the windowsill beats a plastic clamshell of wilted supermarket leaves every single time. And unlike an outdoor herb bed, an indoor kitchen garden doesn't care what month it is: with the right window (or a modest grow light) you can be snipping fresh chives into your eggs in the depths of January. This guide covers what herbs actually need indoors — which is more light and less water than most people expect — and how to keep them producing instead of slowly stretching into sad green threads.

Light: the make-or-break factor

Nearly every indoor herb failure traces back to light. Herbs are sun plants. Most of them want the equivalent of six to eight hours of direct sun a day — which indoors means a bright, unobstructed south-facing windowsill. An east- or west-facing window can work for the tougher herbs (mint, chives, parsley), but a north-facing window will not grow you a usable herb; it will grow you a pale, leggy disappointment.

The honest fix for most homes, especially in winter, is a small full-spectrum grow light. Position it 15–30 cm above the foliage and run it 12–16 hours a day on a cheap timer. A single clip-on bar over the kitchen counter is enough for three or four pots, and it turns herb growing from a summer hobby into a year-round one.

The easiest herbs to grow indoors

• Basil — fast and generous, but the most light-hungry of the bunch; give it the best spot or a grow light.
• Mint — nearly indestructible and happy with less light; keep it in its own pot, always, because it wants to take over.
• Chives — cut them right down and they regrow; one of the best winter performers.
• Parsley — slow to germinate but crops for months once going.
• Thyme and oregano — Mediterranean, drought-tolerant, and happiest slightly neglected in a terracotta pot.

Rosemary, sage and bay can live indoors too, but they're fussier: they want maximum light, cool nights and restrained watering. Get a season of basil and chives under your belt first. And if you've inherited an unlabelled pot and aren't sure what herb you're looking at, snap it with PlantMe — the app recognises plants across 35,000+ species and cultivars and tells you exactly what care it wants.

Pots and soil

Every pot needs a drainage hole. That rule has no exceptions for herbs — soggy compost kills Mediterranean herbs faster than any pest. Terracotta is ideal because the clay breathes and lets the root ball dry evenly. Use a standard free-draining potting mix; for thyme, oregano, rosemary and sage, cut it with about a third grit or perlite.

Give each herb its own pot rather than planting a mixed trough. Basil wants steady moisture; thyme wants to bake. In one container, one of them always loses. Separate pots also mean you can rotate each plant to the light and replace a spent one without disturbing the rest.

Watering and feeding

Water when the top 2–3 cm of soil feels dry, then water thoroughly until it runs from the drainage hole and empty the saucer. In a warm kitchen that might be twice a week for basil and every ten days for thyme. When in doubt, wait a day — most indoor herbs tolerate slight drought far better than wet feet.

Herbs need less fertiliser than other houseplants, and overfeeding actually dulls their flavour. A half-strength liquid feed once a month through spring and summer is plenty; skip feeding entirely in winter unless the plant is under a grow light and actively producing.

Harvesting: little and often

Harvesting is pruning, and pruning is what keeps a herb bushy. For basil, pinch just above a pair of leaves — the stem forks and you get two shoots where there was one. Never strip single leaves from the bottom of the plant. For leafy annuals like basil and parsley you can cut back hard, leaving 10–15 cm of stem; for woody perennials like thyme, sage and oregano, never take more than the top third at once.

If a basil plant starts pushing up a flower spike, pinch it out immediately — once it flowers, leaf production slows and the flavour turns bitter.

Common problems

• Leggy, stretched stems with small leaves: not enough light. Move it or add a grow light — it will not adapt.
• Yellowing lower leaves and a musty smell: overwatering. Let it dry out and check the drainage hole isn't blocked.
• Fine webbing and speckled leaves: spider mites, which love dry indoor air. Shower the plant and treat promptly.
• Tiny black flies around the soil: fungus gnats, a sign the compost is staying wet too long.
• Weak flavour: usually light again — flavour compounds build in strong sun. More light, less fertiliser.

Not sure which problem you're looking at? Point PlantMe's camera at the plant — the app diagnoses issues across 500+ plant diseases and gives you a treatment plan in seconds.