How to Save Chilli & Pepper Seeds: Ripe Pods, Crossing & Drying

The last chillies of the year are colouring on the windowsill and in the greenhouse now, and one of them is worth more than the rest: the pod from the plant that fruited earliest, cropped heaviest or had exactly the heat you wanted. Scrape the seed out before it goes into the pan. Saving chilli and pepper seeds is simpler than saving tomato seed — there is no gel, so there is no fermenting — but it has one trap that catches almost everyone: peppers cross with each other far more readily than tomatoes do, and you cannot see it until next summer. Here is how to save chilli seeds that come true, which pods to choose, how to dry and store the seed, and how to keep a Habanero from turning into a Jalapeño cross along the way.

• Save from Open-pollinated varieties · fully coloured, ripe pods · healthy plants
• Crossing Common between varieties grown together · bag flowers for guaranteed purity
• Dry 1–2 weeks on a plate at room temperature · no fermenting, never above 35 °C
• Keeps 2–3 years in a cool cupboard · 5 or more in an airtight jar in the fridge

Which chillies and peppers come true from seed

Start with the label. Seed from an open-pollinated variety grows into the same pepper next year, provided it was not crossed. Seed from an F1 hybrid — Tinkerbell F1, Reina F1, Redskin F1, Palladio F1 or Atris F1 in our range — will germinate, but the seedlings scatter back towards their parents in size, colour and heat. Our guide to heirloom vs F1 vs organic seeds explains why. The good news is that most chillies are open-pollinated: Cayenne, Jalapeño, Serrano, Padrón, Fresno, Scotch Bonnet, Habanero, Madame Jeanette, Bhut Jolokia, Carolina Reaper and the Dorset Naga all come true, as do sweet peppers such as California Wonder, Yolo Wonder, Corno Rosso and Giallo d'Asti.

Species matter too. Capsicum annuum (most sweet peppers, Cayenne, Jalapeño), C. chinense (Habanero, Scotch Bonnet, the superhots) and C. frutescens (Rawit, Tabasco) cross with one another freely. C. baccatum, the Lemon Drop group, crosses with them less readily but not never. So "they are different species" is no protection on a shared windowsill.

The crossing problem — and why you will not see it this year

A pepper flower pollinates itself, and indoors on a windowsill with no insects it usually does. In a greenhouse or garden, bees and hoverflies carry pollen between plants, and studies of open-field peppers have measured cross-pollination anywhere from a few per cent to well over a third. The catch is that the pod itself never shows it. The fruit wall is the mother plant's tissue, so a Habanero pollinated by a Jalapeño still looks and tastes like a Habanero. Only the seed inside carries the cross, and the surprise appears next July.

You have three ways to make sure:

• Grow one variety, or keep the varieties you want to save in separate rooms or greenhouses.
• Bag flowers before they open. Slip an organza bag or a square of fleece over a cluster of unopened buds, tie it loosely, and leave it on until small pods have set. Tie a piece of wool round those stems so you know which pods to save.
• Grow indoors on a windowsill, where the plants self-pollinate — tap the flowering stems each morning to help.

How to save chilli seeds, step by step

1. Choose a fully ripe pod Pick from your best plant, and wait until the pod has reached its final colour — red, orange, yellow, chocolate — and is starting to soften or wrinkle slightly. Green pods, including green Jalapeños and Padróns, hold immature seed that rarely germinates well.
2. Let it rest for a week A pod picked just as it coloured benefits from a few more days indoors at room temperature. The seed keeps maturing inside, and germination is noticeably better. Do not let it rot.
3. Put gloves on first The heat of a chilli is concentrated in the pale pith that holds the seed, and it transfers to fingers, knives and eyes. Wear disposable gloves for anything hotter than a Jalapeño, work on a board you can wash, and open a window for superhots.
4. Scrape the seed out Cut round the top of the pod, pull out the core, and scrape the seeds off the pith with a teaspoon or the back of a knife onto a china plate. One variety per plate, labelled before you start — pepper seeds all look the same.
5. Dry slowly, out of the sun Spread the seed in a single layer and leave it at room temperature for one to two weeks, stirring every few days. No fermenting and no rinsing are needed. Never dry seed in the oven, on a radiator or in a sunny window: above about 35 °C the embryo is damaged.
6. Test, then pack Dry pepper seed snaps rather than bends when pressed with a fingernail. Pack it into a paper envelope inside an airtight jar with the name, species and year, and store it cool and dark — the method in our guide to storing and preserving seeds.

Chilli seed vs tomato seed: what is different

The short life of pepper seed is the one number to remember. Chilli seed stored in a kitchen drawer loses vigour after two or three years, so a small annual batch of fresh seed is better than a big tin that you draw on for a decade. How long seeds last gives the figures for every crop and explains the ten-seed germination test. For the wet-seeded crops, see our guides to saving tomato seeds, cucumber seeds and pumpkin and squash seeds.

Common chilli seed-saving mistakes

• Saving from green pods — the seed is immature. Wait for full colour.
• Saving from an F1 — the plants will not repeat. Check the packet first.
• Ignoring crossing — five varieties flowering together in one greenhouse give mixed seed. Bag a few flowers.
• Drying with heat — oven, radiator or dehydrator seed rarely grows. Room temperature only.
• Saving from a mottled plant — pepper mild mottle virus and tobacco mosaic travel on the seed coat. Save only from healthy plants.
• Bare hands on a superhot — capsaicin burns for hours and finds your eyes. Gloves, always.

Frequently asked questions

Do you need to ferment pepper seeds like tomato seeds?
No. Pepper seeds are dry and are not surrounded by a germination-blocking gel, so they only need scraping off the pith and drying. Fermenting adds nothing and risks the seed sprouting in the jar.

Can I save seeds from dried chillies?
Sometimes, but treat it as a gamble. Seed from pods that air-dried slowly on a string at room temperature was never heated and can still germinate, though usually patchily; for seed you want to rely on, take it from a fresh, fully ripe pod. Seed from oven-dried or dehydrated pods, or from shop-bought chilli flakes, is rarely viable. Our guide to drying chillies explains which varieties air-dry.

Can I save seeds from supermarket peppers?
Red, yellow and orange bell peppers from a shop are usually F1 hybrids, so the seed grows but the fruit will vary. Green peppers are simply unripe, and their seed is too immature to rely on. For a variety worth keeping, start from an open-pollinated packet, such as those in our sweet pepper or chilli pepper collections.

When should I sow saved chilli seeds?
The same as bought seed: Habaneros and other C. chinense in January or February, most C. annuum from February to April, with bottom heat of 25–28 °C. The seeds to sow in February collection shows what starts then, and your best plant can also be overwintered indoors for an earlier crop.

A plate, a pair of gloves and two weeks on the kitchen shelf turn this year's best chilli into next year's plants. While the seed dries, the greenhouse beside it is emptying — if you grew melons there, our new guide to growing watermelons from seed shows how to plan next summer's crop. Browse the full pepper seed range, the Capsicum chinense and Capsicum annuum collections, the wider vegetable seeds or all our seeds, and keep our growing guides and vegetable sowing calendar to hand for the season ahead.