DIY Pepper Spray: A Natural Insect Repellent for Houseplants

How Pepper Spray Works

The heat in peppers comes from capsaicin, a compound that irritates and repels many soft-bodied insects. Found in chili peppers, cayenne, paprika, and even some herbs like dill, capsaicin makes an effective, low-cost pest deterrent for indoor plants.

Homemade Pepper Spray Recipe

1. Boil 2–3 cups of water.
2. Add ½ cup finely chopped or ground hot peppers (the hotter, the better).
3. Remove from heat and let steep for 24 hours.
4. Strain through cheesecloth or a fine mesh sieve into a spray bottle.
5. Add a few drops of biodegradable liquid soap to help the solution adhere to leaves.

Application & Safety

Spray all plant surfaces, focusing on leaf undersides where pests hide. Reapply every 5–7 days or after watering. Wear gloves and eye protection—capsaicin can burn skin and eyes. Avoid spraying in direct sunlight to prevent leaf scorch. Commercial pepper sprays are also available if you prefer a ready-to-use option.

Best Targets

Works well against aphids, spider mites, whiteflies, and thrips. Less effective on hard-bodied insects like scale or beetles.