Homemade Chilli Pest Spray

One of the most well-known and effective natural pest deterrents a gardener can have on hand is chilli. There are many recipes for chilli sprays out there, but here are our versions, guaranteed to knock those not-so-nice plant-destroying bugs off their perch.

Chilli Spray #1

  1. Crush and grind 4C of ripe chilli pods or 5C of chilli seeds.
  2. Place in a pan with 3L of water and boil for 15-20 minutes.
  3. Take off the heat and add another 3L of water. Leave to cool.
  4. Filter through a cloth, then add soap to the liquid so the mixture sticks to the leaves and the pests (use a potash-based soft soap that you would use for washing dishes, not the modern washing powders that contain caustic soda which will harm plants).

How to use:

Use as a spray, or sprinkle the mix over plants using twigs or grass tied together to form a brush. Test the strength of the mixture on your plants first, as it can be too strong for some delicate foliage.

This chilli spray is effective against most insects, including caterpillars, aphids, flies, ants and mealy bugs. Apply once a week if the weather is dry, or two or three times a week if it rains. It is important to use this solution as a preventative measure.

Chilli Spray #2

  • Slice 500g of ripe chilli pods and place in a bucket filled with water.
  • Leave to decompose for 4-5 days.
  • Sieve the mixture and keep the liquid.
  • Dissolve 30g of potash-based dishwashing soap into this liquid.

How to use:

As per Chilli Spray #1.

Chilli and Garlic Spray

  • Grind 1 garlic bulb and 1 onion.
  • Add 1T of powdered chilli peppers.
  • Stir into 2L of hot water. Leave the mixture to cool.
  • Strain through a fine cloth and add 1T of soft soap. Stir well.

How to use:

Use as a spray for caterpillars in fruit trees.

Chilli, Mexican Marigold and Onion Spray

  • Chop 4 chilli pods, 4 onions and a handful of Mexican marigold leaves.
  • Soak for 1 day in soapy water (using a potash-based soft soap, as above).
  • Strain using a sieve then add 2L of water to the liquid.

How to use:

Spray onto red spider mite infestations.

Chilli Dust

  • Grind as many dried ripe chilli pods as required.

How to use:

Sprinkle the powder around the base of plants to repel ants, cutworms, slugs and snails, as well as many soil pests.

Interplanting Chilli

Chillies can be interplanted with vegetable crops to act as a repellent against many insects, fungi and viruses.


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