Growing Herbs on a North-Facing Windowsill

A north-facing windowsill gets a poor reputation in British gardening circles, and it is not entirely unfair. In most UK homes it receives little to no direct sunlight, particularly between October and March, and the light that does arrive is cool and indirect. Yet the windowsill itself is often the warmest, most sheltered spot in a small kitchen, and that combination suits a handful of culinary herbs surprisingly well. Mint, chives and parsley will all crop steadily on a north-facing ledge if you pay attention to two things: turning the pots and watering with restraint.

Why these three herbs cope with low light

Most Mediterranean herbs — rosemary, thyme, oregano, basil — evolved on sunny hillsides and simply stall without strong light. They stretch, pale and eventually give up. The herbs that thrive in shade tend to be leafy, soft-stemmed plants from woodland edges or damp meadows, and mint, chives and parsley fit that description neatly.

Mint is the most forgiving of the three. It will grow in almost any light level and is genuinely difficult to kill, which makes it ideal for a beginner. Chives are bulbs rather than true stems, so they store energy underground and can push up fresh green shoots even in a dim February. Parsley is the slowest to establish but rewards patience, producing a dense crop of leaves that keeps going for months if you never strip it bare.

Setting up the windowsill properly

Before you buy a single plant, check the practicalities. North-facing glass can be cold in winter and surprisingly warm in summer, so aim for a middle position rather than pressing pots against the pane.

• Pots: choose containers at least 15cm across with drainage holes. Mint in particular needs room — its roots run.
• Compost: a peat-free multi-purpose compost is fine. Add a handful of perlite or horticultural grit for drainage.
• Saucers: use them, but empty them after twenty minutes. Standing water is the fastest route to root rot.
• Position: keep plants away from radiators, which dry the air and cook leaves, and away from draughty single-glazed gaps.

If your windowsill is genuinely dark — say, overshadowed by a wall or a neighbouring building — a small clip-on LED grow light will make the difference between a struggling plant and a productive one. It is not essential, but it is honest advice.

Rotate the pots every week

This is the single most useful habit for a north-facing sill. Plants always lean towards whatever light there is, and on a north sill that lean is pronounced. Left alone for a fortnight, a parsley plant will flop sideways and grow lopsided, with one side of the pot bare.

Give every pot a quarter turn clockwise once a week, ideally on the same day so you do not forget. A simple marker — a small sticker on the rim, or a lolly stick pushed into the compost — makes it easy to see which way the pot was facing last time. Rotating keeps growth even, stops the stems from becoming weak and spindly, and means you harvest from all round the plant rather than just the sunny side.

Watering: less than you think

Overwatering kills more windowsill herbs than shade ever will. Compost in a cool, dim spot dries out slowly, and the temptation to water every morning is strong. Resist it.

Test before you pour. Push a finger about 2cm into the compost. If it feels damp, wait. If it feels dry at that depth, water until a little runs through the drainage holes, then stop. In winter, once a week may be plenty; in a warm summer kitchen, every two or three days is more likely.

• Water in the morning, not at night, so surplus moisture evaporates.
• Use room-temperature water — cold tap water shocks tender roots.
• Yellowing lower leaves and a sour smell usually mean too much water, not too little.
• Misting is rarely needed and can encourage mildew in still air.

Feeding, harvesting and keeping the crop going

Start feeding lightly in March, once growth picks up, and stop by September. A diluted liquid feed every fortnight is enough; herbs grown for flavour do not want rich, forcing conditions, which produce soft leaves with less taste.

Harvest little and often. With mint, pinch the top pair of leaves to encourage bushy growth, and never take more than a third of the plant at once. With chives, snip individual leaves close to the base with scissors rather than pulling — the plant will regrow within a fortnight through most of the year. With parsley, take outer stems first and leave the crown untouched, so new leaves keep coming from the centre.

Expect a natural slowdown from November to February. Growth will not stop entirely on a sheltered indoor sill, but it will be modest. Keep watering minimal, skip the feed, and let the plants rest. By early spring, chives will be the first to respond, followed by mint, with parsley catching up last. A north-facing windowsill will never give you a glut, but it will give you a steady pinch of something fresh in almost every month of the year — and that is worth far more than it sounds.