Pick the Right Windowsill

British light is a fickle friend, but a south- or west-facing windowsill gives herbs the six to eight hours of direct sun they crave. Basil and mint will sulk in shade, while parsley tolerates a little less. If your only sill faces north, choose mint or parsley and accept slower growth. Rotate pots a quarter turn every few days so stems grow straight rather than lunging at the glass. A windowsill above a radiator is a death trap for basil: dry, hot air crisps leaves overnight. Keep tender herbs away from draughts too, as cold snaps stall growth.

Water with Care, Not Calendar

Overwatering kills more indoor herbs than neglect. Basil likes consistently moist compost but never soggy roots; parsley prefers slightly drier conditions between waterings; mint sits happily in soil that stays damp. Check the top two centimetres with your finger. If it feels dry, water until it runs from the drainage holes, then empty the saucer. If it clings to your finger, wait a day. In winter, cut watering back drastically. Terracotta pots dry faster than plastic, and small pots dry faster than large ones. Grouping pots together raises humidity, which basil and mint appreciate. A weekly misting helps parsley, but don't soak leaves in strong sunlight—spots burn.

Pinch Out to Keep Plants Bushy

The secret to a generous herb plant is regular pinching. When basil has three or four sets of true leaves, pinch out the growing tip just above a leaf pair. This signals the plant to branch, giving you more leaves to harvest. Repeat every couple of weeks. For mint, pinch the top two leaves of each stem to encourage side shoots. Parsley is different: it grows from a central crown, so never cut the growing point. Instead, snip outer stems at the base. Remove any flower buds immediately—once herbs flower, leaf flavour turns bitter and production stops. Use your fingernails or sharp scissors; clean cuts heal faster.

Feed Lightly and Regularly

Herbs in small pots exhaust their compost within weeks. From spring to early autumn, feed every fortnight with a weak liquid fertiliser—half the recommended strength. Basil and mint are hungry; parsley needs less. Too much feed makes lush, soft growth that pests love and flavour lacks. A diluted seaweed feed is ideal. Stop feeding in late autumn and winter when growth slows. If leaves turn pale yellow between green veins, that's a sign of hunger; if leaf edges brown and crisp, you've overfed. Flush the pot with plain water and skip the next feed.

Harvest Often, but Never Strip Bare

Regular harvesting keeps herbs productive. For basil, take no more than a third of the plant at once, always cutting above a leaf node. For mint, snip stems just above a pair of leaves. Parsley: remove entire outer stalks from the base, leaving the inner crown to regenerate. Never take more than a few leaves from a young plant. Water before harvesting, not after, so cuts have time to form a callus. Use herbs immediately for the best flavour; washing destroys delicate oils, so wipe basil leaves with a damp cloth instead. A monthly trim of mint roots—yes, roots—keeps it from strangling itself in its pot.

Solve Common Windowsill Problems

Leggy stems mean too little light. Move pots closer to the glass or add a simple desk lamp with a daylight bulb for a few hours. Yellow lower leaves usually signal overwatering or poor drainage; repot into fresh compost with added grit. Tiny black flies are fungus gnats, born from soggy compost. Let the top layer dry out and cover it with a centimetre of horticultural sand. White powdery patches on leaves are mildew: improve air circulation and remove affected leaves. If mint wilts despite damp compost, check for root congestion—mint fills a pot with roots fast. Divide it every spring. Basil dropped leaves after a cold night? It hates temperatures below 10°C, so bring it away from the window after dark in winter. With these habits, a humble windowsill will keep you in fresh herbs from February to November—and a sprig of mint for your new potatoes is worth every bit of fuss.