Why the Kitchen Windowsill Beats a Herb Bed

You will pick more herbs from a bright kitchen windowsill than from a bed at the end of the garden, simply because you walk past them twenty times a day. A snip here while the kettle boils, a few leaves there over the chopping board — that steady, casual harvesting is exactly what keeps basil, parsley and chives bushy and productive. The light is usually good, the pots are within reach, and you notice problems while they are still small.

There is one caveat. A windowsill sitting directly above a radiator is a harsh place in winter, and a north-facing sill will never really suit basil. Watch where the sun falls through the day before you commit, and remember that a sill which bakes at midday in July may need the curtain half-drawn to stop leaves scorching against the glass.

Three Herbs That Earn Their Keep

• Basil — the thirstiest for light and warmth. Sow from March to May on a warm sill, or split a supermarket pot into three or four smaller plants, which is far cheaper than buying seedlings. It sulks below about 10°C, so keep it away from cold glass on winter nights.
• Parsley — flat-leaved types give the best flavour for cooking, curly types look smarter in a pot. Sow February to April, or again in August for a winter crop. It is a biennial, so it will run to seed in its second year; sow fresh each spring rather than nursing an old plant.
• Chives — the toughest of the three and the most forgiving if you forget to water. Buy a clump and divide it, or sow in spring. Snip the leaves, never pull them, and the plant will keep producing for years.

If you have room for a fourth pot, mint is worth it — but keep it firmly to itself, as it romps through anything planted beside it.

Pots, Compost and the Humble Saucer

Choose pots around 12–15cm across with proper drainage holes. Terracotta looks lovely and dries out faster; plastic holds moisture better and is easier to keep on a sill. Either works, but never use a pot without holes.

Fill with a peat-free multi-purpose compost, or a soil-based potting compost for parsley and chives, which prefer something a little heavier. Leave a 2cm gap below the rim so you can water without it running straight over the edge.

Now the saucer — the most underrated piece of kit on the sill. It catches what drains through, keeps the woodwork dry, and lets you water from below, which encourages roots downwards rather than leaving them sitting near the surface. Empty any water left standing after half an hour, otherwise the compost turns sour and the roots rot.

Watering and a Fortnightly Feed

Little and often beats a weekly flood. Push a finger about 2cm into the compost: if it feels dry at that depth, water. In summer that may be daily; in a cool January kitchen, once a week is plenty. Rainwater from a butt or a jug left overnight is kinder than straight tap water, particularly in hard-water areas where the lime can leave a crust on the compost surface.

Because pot compost runs out of nutrients within about six weeks, feeding matters. From roughly a month after potting, give a diluted liquid feed once a fortnight — a general-purpose feed for parsley and chives, and a tomato-type feed, higher in potash, for basil once it starts producing heavily. Water the compost first, then feed, so you never pour strong feed onto dry roots. Ease off entirely from late autumn to early spring, when growth slows and unused feed simply builds up in the pot.

Turn each pot a quarter turn every week or so. Herbs lean towards the light, and a weekly twist keeps them growing straight rather than pressed flat against the pane.

Picking Little and Often

Regular picking is the secret to a long-lasting plant. Left alone, basil stretches upwards, flowers and gives up; cut it and it branches. Pinch out the growing tip just above a pair of leaves, and take no more than a third of the plant at any one time.

• Basil: snip individual leaves or whole stems from the top. Remove flower buds the moment you see them.
• Parsley: harvest the outer stems at the base, working inwards, and leave the young centre to grow on.
• Chives: cut whole leaves about 2–3cm from the compost with scissors. They regrow within a fortnight in summer.

Wash and use straight away where you can — a sprig that goes from sill to saucepan in thirty seconds tastes nothing like one from a plastic packet.

Keeping the Sill Healthy

Check your plants every few days, ideally when you water. Greenfly gather on soft new basil shoots; a firm jet of water from a spray bottle usually knocks them back, and picking off badly infested tips keeps things under control without chemicals you would rather not have near your food.

Small black flies hovering around the pots are fungus gnats, a sign of compost kept too wet. Let the surface dry between waterings and stand the pots on a layer of grit. A pale, stretched plant is short of light — move it closer to the glass. Yellowing lower leaves on parsley often simply means the pot is too dry, or that the plant is root-bound and ready for a size up.

Refresh your pots each spring with new compost and, where it suits, a fresh sowing. With decent light, a saucer under each pot and a feed every fortnight, you will have cut-and-come-again herbs on hand from March right through to the first hard frost.