Adopt a Wilting Basil: The Reduced-Shelf Herb Rescue Mission

There is a particular hour on a November evening when the supermarket herb shelf gives up. The basil has gone limp at the stem, the coriander is yellowing from the bottom up, and somebody has knocked a mint pot on its side and left it there. Everything is stickered down to 39p. And every week, most of it goes in the bin.

I've been rescuing these pots for years now, first out of thrift and now mostly out of stubbornness. Some of them die. A few of them turn into something genuinely useful on a kitchen windowsill in January, which in this country is a small miracle worth having.

First, the honest bit: why supermarket herbs collapse

Nobody is cursing you. Those pots are grown fast in warm polytunnels abroad, crammed with a dozen or more seedlings that should never have shared a 9cm pot, and rushed to a shop where they sit in the dark under a shelf. By the time you get them home the roots have nowhere to go, the compost is exhausted, and the plant is essentially living on fumes and photosynthesis.

So the collapse isn't your fault, and it isn't a sign you're bad at plants. It's a housing crisis. Fix the housing and you've got a decent chance.

The ones worth the 39p

Be choosy. This is a rescue mission, not a collection.

Mint is the best value on the shelf by a mile. It's tough, it's greedy, and it will forgive almost anything except drying out completely. Grab it.

Basil is worth it only if the stems are still firm and green rather than black and hollow. If the leaves are translucent and the stem has gone squidgy at the base, walk on. Basil is a Mediterranean sun worshipper and a British November is not its idea of a holiday, so expect a scrappy, defiant existence rather than a lush bush.

Parsley is slower but sturdier, and a flat-leaf pot divided up will keep cropping for months.

Coriander grows so fast from seed that rescuing a pot is really just buying yourself instant leaves. Fine if you want them tonight for a curry, pointless if you're planning ahead.

Chives divide beautifully and come back year after year.

Rosemary and thyme in supermarket pots are usually already dead in a way that only becomes obvious a fortnight later. Skip them and buy a proper plant from a garden centre.

The triage bench: the first hour

Get them out of the plastic sleeve, because that sleeve is a sauna. Stand the pot in a saucer and water from below for twenty minutes, then let it drain properly — I use an old baking tray to protect the windowsill.

Pick off anything completely yellow or brown. Check the base of the stems for grey fuzz, which is botrytis and means game over. And keep new arrivals away from your established houseplants for a week or so, because supermarket compost is a notorious courier for fungus gnats.

Divide and conquer

This is the single biggest favour you can do a supermarket herb. Knock the rootball out, and you'll see what I mean: a dense mat of roots with a dozen stems fighting over it.

Tease it apart with your fingers, or two old table knives if it's really tight. Pot the clumps into individual 9cm pots using a free-draining mix — ordinary compost cut with a good handful of perlite or horticultural grit. Basil is happiest in clumps of three or four stems rather than singles; mint can go solo and will still try to take over the world.

You have now turned one doomed pot into four or five plants. That's the whole trick.

Light and warmth, without the radiator trap

The brightest windowsill you have, ideally south-facing, and as much of it as you can get between now and March. Realistically that's not much. A cheap LED grow bar or a clip-on lamp for four hours in the evening will make an obvious difference to basil, less so to mint.

Warmth matters, cold draughts matter more. Basil sulks below about 12°C and will go black at the first proper frost. A windowsill directly behind a curtain is a cold, damp place at 2am in December, so either move the pots to a shelf nearby overnight or accept that one bad night may finish them.

Mint, meanwhile, is the opposite. It actually wants a cooler, semi-shaded spot and will happily go quiet and half-die back over winter. Don't panic and don't overwater it — dormancy is not death.

The setup that stops everything turning to mush

Three things: drainage, airflow, and restraint with the watering can.

Water from below, let the top couple of centimetres dry out before you do it again, and never leave a pot standing in water. In November that might mean watering once a week. Overwatering kills far more windowsill herbs than neglect does.

Run a small USB fan on low for ten minutes a day, or just give the pots a quarter turn and a gentle ruffle when you walk past. Air movement is what keeps mould off dense basil foliage. And don't mist them, whatever the internet says — damp leaves in a cold room is asking for trouble.

What success actually looks like

Not a jungle. In January, success is enough leaves to tear over a bowl of pasta, a mint that's still alive and pretending it isn't, and a few basil cuttings rooting in a glass of water on the sill because you read somewhere that it works. (It does, slowly, and about half of them take.)

The ledger doesn't really add up if you count only the leaves. Four pots at 39p each against a £2 bag of basil isn't a fortune either way. What you're actually buying is something to check on in the morning, a bit of green in the gloomiest month of the year, and the small satisfaction of having taken in something everyone else had written off.

Which is, if we're being honest, the entire lockdown gardening philosophy in one sticky reduced-shelf pot.