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How to germinate chilli seeds

Chillies aren't hard to germinate, but they're slower and fussier about warmth than most veges. Get the temperature right and the rest mostly takes care of itself. Here are the methods we use, from basic to serious.

When to sow: late winter to early spring (August to October) for most of NZ, so plants are ready to go out once frosts have passed. Superhots benefit from the earliest start you can manage.

1. The traditional method: sowing in soil

The classic approach, and it works for most varieties.

You'll need:

  • Seed trays or small pots
  • Seed-raising mix (light and free-draining)
  • A spray bottle
  • A clear plastic bag or cling film

Steps:

  1. Fill trays or pots with seed-raising mix and firm it down lightly.
  2. Sow one seed per cell, about 5 mm deep, and cover with a little more mix.
  3. Mist with the spray bottle until evenly damp.
  4. Cover with the plastic bag or cling film to hold in warmth and moisture.
  5. Put the tray somewhere warm. Chilli seeds want 20 to 30°C to germinate. A sunny windowsill works, a heated propagator works better.
  6. Keep the mix moist but never waterlogged, and be patient. Germination takes anywhere from 1 to 4 weeks depending on the variety. Superhots sit at the slow end.

2. The paper towel method

Good if you want to see exactly what's happening, or you're testing older seed.

You'll need:

  • Paper towels
  • A sealable plastic bag or lidded container

Steps:

  1. Dampen a paper towel so it's moist, not dripping.
  2. Space your seeds over one half and fold the other half over the top.
  3. Slide it into the bag or container and seal it.
  4. Keep it somewhere warm. The hot water cupboard is the classic Kiwi spot, just check it daily so it doesn't cook or dry out.
  5. You should see tiny roots within 1 to 2 weeks.
  6. Once a root appears, pot the seed up straight away. Handle it by the seed, not the root.

3. Peat pellets

Tidy, low-mess, and the seedling never has its roots disturbed.

You'll need:

  • Peat or coir pellets (any garden centre)
  • A tray to hold them

Steps:

  1. Soak the pellets in water until they swell up.
  2. Push one seed into the centre of each, about 5 mm deep.
  3. Keep them warm, ideally 25 to 30°C.
  4. Don't let them dry out. Pellets dry faster than pots.
  5. Once seedlings are a few centimetres tall, plant the whole pellet into a bigger pot.

4. Heat mats and germination stations

If you're sowing early, chasing superhots, or just tired of patchy results, gentle bottom heat is the single best upgrade you can make.

You'll need:

  • A heat mat or germination station
  • Seed trays and seed-raising mix

Steps:

  1. Set up the mat or station somewhere it can run undisturbed.
  2. Sow seeds as per the traditional method.
  3. Sit the trays on the heat and follow the gear's instructions.
  4. Consistent warmth speeds things up noticeably. Expect results in as little as a week or two.

5. Pre-soaking

Not a method on its own, but a useful head start, especially for superhots with tough seed coats.

Steps:

  1. Soak seeds in warm water for 12 to 24 hours before sowing.
  2. Sow using any of the methods above.
  3. Keep warm and moist as usual.

Whichever way you go, warmth and patience do most of the work. Happy growing.