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Homemade insecticide spray

Cheap. natural, climate-friendly insect spray to protect all your plants from pests

Homemade insecticide spray

This is especially great for protecting brassica plants (plants in the cabbage family – cabbages, broccoli, cauliflower, kale, mustard, radish, horseradish etc.).


  • 5 – 6 cloves of garlic – use big cloves

  • 1 onion

  • 5 – 6 freshly chopped hot peppers/cayenne. (Only use fresh, NOT powdered, as this will seriously clog up your spray bottle and it could well be impossible to unclog thereafter.)


  • Boil the water and let it cool a little

  • Chop up onion

  • Roughly chop up garlic

  • Put ingredients in a really big jug/glass bowl/pan and pour boiled water over the top (approx. 500ml)

  • Leave to steep, ideally overnight

  • Once steeped and cooled stir really well

  • Strain through a large sieve and fill your spray bottle.

NOTE: You may need to keep this in the fridge. Be warned that it is super stinky, so you want to minimise getting this on your hands and definitely not on your clothes! Spray on plants to protect from pests. Spray early in day, to allow time for liquid to dry and to reduce risk of fungal infection. Use about once a week. You may need to do this more often if it rains, especially if you can no longer smell the spray on the plants.

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