Most herb problems are quiet ones. A basil seedling flops overnight, a rosemary sulks in a shady corner, a bay in a pot that hasn’t been changed in years turns slowly pale. Nothing dramatic happens; the plant simply never gets going, and it’s tempting to conclude that herbs are fussy. They aren’t. They’re specific. Most of the disappointment UK gardeners meet comes down to a short list of habits, and every one of them can be corrected this weekend.

1. Watering by the calendar instead of by the soil

Overwatering accounts for more dead herbs than drought. Rosemary, thyme, sage, oregano and lavender come from dry, rocky hillsides; their roots need air as much as moisture, and a week in a soggy pot is often enough to finish them off. Push a finger 2–3cm into the compost before you water, and only water if it feels dry at that depth.

Water in the morning where you can, so splashes on the leaves dry before evening, and empty saucers after rain. Soft-leaved herbs — basil, parsley, mint, chives — are thirstier and will take more regular watering, but even they prefer damp rather than wet. Yellowing lower leaves, wilting despite wet compost and little black flies around the pot all point the same way: let the compost dry out, move the pot somewhere airy, and water less.

2. Choosing the spot for convenience rather than light

Most culinary herbs want six hours or more of direct sun. In the UK that means a south- or south-west-facing bed, a sunny patio, or a windowsill that genuinely catches the sun. A “bright” north-facing kitchen windowsill suits mint and parsley; basil and rosemary will stretch, pale and disappoint there.

Rotate windowsill pots a quarter turn each week so plants don’t lean one way, and move pots with the seasons. A spot that fries on a south-facing wall in July can be ideal in April, and in high summer basil may scorch — heat stress rather than lack of light, which a little afternoon shade will cure. Thin, pale, leggy growth is almost always a light problem, and no amount of feeding will fix it.

3. Growing Mediterranean herbs in rich compost and feeding them weekly

A rosemary in rich multipurpose compost, fed fortnightly with tomato food, grows soft and leafy and tastes of very little. Woody herbs do better in lean, gritty, free-draining conditions; the aromatic oils that give them their flavour build up when growth is steady rather than lush.

For pots, mix two parts multipurpose compost with one part horticultural grit. Feed rosemary, thyme, sage and oregano sparingly — once in spring as growth starts, perhaps once more in midsummer. Leafy herbs grown for bulk, such as basil, parsley, mint and chives, do appreciate a weak liquid feed every couple of weeks during the growing season, because compost in a pot runs out of nutrients after a few weeks. Half-strength is a good habit.

4. Treating every herb as though it wants the same things

Grouping plants by their needs saves a great deal of guesswork. Roughly speaking:

• Woody Mediterranean: rosemary, thyme, sage, oregano, lavender, winter savory. Sun, grit, sharp drainage, little feeding, and avoid cutting into old leafless wood.
• Soft annuals: basil, coriander, dill, chervil. Steady warmth, regular water, succession sowing, frequent picking.
• Moisture-lovers: mint, lovage, parsley. Happier in partial shade with compost that stays damp. Keep mint in its own pot — it spreads.
• Biennials: parsley and angelica. They flower in their second year and then stop producing leaves, so sow fresh each season.

Plant a rosemary and a mint side by side in the same bed at your peril: one will drown while the other bakes.

5. Ignoring drainage and cramming roots

Every pot needs a clear drainage hole, and if there’s a saucer underneath, empty it. A thick layer of crocks in the base is a long-standing habit but not a necessary one — a single broken piece to stop compost washing out is plenty, and deep layers can actually slow drainage. Use a gritty mix, raise pots slightly on feet, and repot when roots start circling the inside of the pot. Moving up one size, roughly 3–5cm wider, is usually the right step. A tiny plant in a huge pot sits in wet compost for weeks.

6. Harvesting too cautiously, or cutting too hard

Timid picking gives you a leggy plant and very little to cook with. Pinch out the growing tips of basil just above a pair of leaves and it will branch into a bushier, more productive plant. Take leaves from the top down and never strip more than about a third at once. Cut whole clumps of chives close to the base and they’ll regrow. Keep mint, basil and coriander from flowering if you want leaves — nip the buds off as they appear.

The opposite mistake is cutting woody herbs hard. Rosemary, sage, thyme and lavender rarely reshoot from old, leafless wood, so keep your clippings to soft new growth and trim lightly after flowering rather than shearing back into bare stems. Don’t take a heavy harvest from a young woody herb in its first year; let it establish.

7. Sowing at the wrong time and expecting instant results

Basil sulks below about 15°C, and sulks even more in a cold frame in March; wait until late spring, or start it indoors on a warm windowsill. Coriander and dill resent root disturbance, so sow them where they are to grow, or into a deep pot, and sow a small pinch every three weeks for a steady supply instead of a glut followed by nothing. Parsley is slow — three to four weeks to germinate is normal, so don’t give up and tip the tray out.

February windowsill light is weak, and seedlings sown too early stretch and topple. Sowing a fortnight later usually gives sturdier plants than sowing early and trying to rescue them.

Your herb-growing checklist

• Check the compost before watering, not the calendar.
• Give sun-lovers six hours of direct light; rotate windowsill pots weekly.
• Mix grit into compost for rosemary, thyme, sage, oregano and lavender.
• Keep mint in its own pot, away from the sun-bathers.
• Empty saucers, and make sure every pot drains freely.
• Pinch basil tips, cut chives low, and keep secateurs away from old woody stems.
• Sow coriander, dill and basil little and often.

Where to start

If you’re putting things right this weekend, start with three pots rather than twenty: a rosemary or thyme in gritty compost on the sunniest spot you have, a mint in its own pot in partial shade, and a basil on a warm, bright windowsill. Get the watering and the light right and most other problems solve themselves. Herbs reward attention far more than effort — a minute with a finger in the compost each morning tells you more than any schedule pinned to the shed wall.

Photo: HeiKiwi / Pixabay