Why the Kitchen Windowsill Works

A kitchen windowsill is one of the most useful growing spaces in a British home. It is warm, it is close to the tap, and you will walk past it several times a day — which matters more than most gardeners admit, because herbs that are seen are herbs that are watered. The trick is choosing the right sill and the right plants for it.

Light is the deciding factor. A south-facing sill gets the strongest, longest light and suits basil best. East-facing gives gentle morning sun, which parsley and chives handle happily. West-facing is decent in summer but can be dim and draughty by November. A north-facing sill is the hardest spot of all — fine for chives in summer, but basil will stretch, pale and sulk through the winter months.

Two other things to watch. First, a sill directly above a radiator creates dry, hot air that crisps leaves and encourages red spider mite. Second, single-glazed or older windows can be genuinely cold at night, and basil in particular dislikes anything below about 10°C. If your sill is chilly, move pots a few centimetres inward at night or stand them on a wooden board for insulation.

Choosing Herbs That Suit a Pot

Not every herb enjoys life in a container. These three are reliable, useful in the kitchen and forgiving of a beginner's mistakes.

• Basil — tender, sun-hungry and fast-growing. Sweet Genovese is the classic; bush types stay compact. Buy a small plant in spring and it will crop for months if you keep pinching it.
• Parsley — flat-leaved French or curly both work. It is a biennial, so a plant bought this year will flower and set seed next year and then give up. Treat it as a two-season crop and sow fresh each spring.
• Chives — hardy, perennial and almost indestructible. They die back to nothing in winter and reappear in March, which makes them excellent value. Snip the leaves, never pull them.

If you want to add mint or coriander, do — but give mint its own pot, because it spreads aggressively and will smother its neighbours. Coriander bolts quickly in warmth, so sow it little and often rather than expecting one plant to last all summer.

Pots, Compost and Drainage

Waterlogging kills more windowsill herbs than drought ever does, and the cause is almost always a pot without proper drainage.

• Use pots at least 15cm across for a single plant, larger for a mixed group. Roots need room and a bigger volume of compost dries out more slowly.
• Check for drainage holes before anything else. If a decorative pot has none, use it as a cachepot and keep the plant in a plain inner pot.
• Fill with a peat-free multipurpose compost mixed with a handful of perlite or horticultural grit. Garden soil compacts in pots and is best left outside.
• Stand everything on a saucer, and add a thin layer of grit to the base of the pot or the top of the compost to keep the crown of the plant dry.

Terracotta looks lovely and breathes well, but dries out fast. Plastic holds moisture longer, which is helpful in a hot kitchen. Either is fine — good drainage matters more than the material.

Planting Up and the First Fortnight

If you are buying supermarket living herbs, they are usually crammed into a pot with dozens of seedlings competing for water. Split them: gently tease the rootball apart and pot up two or three seedlings per 15cm pot. They will thank you within a week.

Plant at the same depth the herb was growing before, firm the compost lightly with your fingers, and water until it runs out of the bottom. Leave the pot to drain fully before returning it to the saucer. Keep new plants out of harsh midday sun for a few days, then move them to their permanent spot. Do not feed for the first fortnight — fresh compost already contains enough nutrients.

Watering and Feeding Through the Year

Little and often beats a weekly flood. Push a finger two centimetres into the compost: if it feels dry at the tip, water. If it feels damp, wait a day. Lifting the pot is a useful check too — a light pot is a thirsty one.

Always empty the saucer about half an hour after watering. Standing water in a warm kitchen is the quickest route to root rot, fungus gnats and grey mould. In summer you may be watering daily; from November to February, once a week is often plenty, and chives may need barely any at all.

Feed basil and parsley every fortnight from April to September with a diluted liquid tomato feed. Chives need very little — one feed a month is ample. Yellowing lower leaves usually mean waterlogging rather than hunger, so check drainage before reaching for the bottle.

Harvesting Well and Keeping Plants Going

• Basil — pinch out the growing tips just above a pair of leaves. This stops it flowering and encourages bushy growth. Never take more than a third of the plant at once.
• Parsley — cut the outer stems at the base, leaving the centre to keep producing. Regular cutting keeps it leafy for longer.
• Chives — snip leaves down to about 2cm from the compost, a few at a time. Remove any flower buds unless you want the pretty purple heads in a salad.

Watch for greenfly clustering on soft new growth, whitefly rising in a cloud when you brush the leaves, and small black flies around the compost, which signal persistently wet soil. A firm jet of water, a sticky yellow trap or simply better drainage usually sorts these out. Pinch off any mouldy leaves straight away and thin crowded growth so air can move.

Refresh tired compost each spring, replace parsley plants every other year, and your windowsill will keep supplying the kitchen almost year-round — a small patch of green that earns its place beside the kettle.