The simplest insecticidal soap is nothing more than a 2% soap solution. To make this at home, you will need:
- Pure Water: Tap water is fine for making insecticidal soap. If you have hard water, you may want to use bottled water to prevent soap scum from building up on your plants.
To make homemade 2% insecticidal soap, mix together:
- 5 tablespoons soap to 1 gallon of water
- 1 heavy tablespoon soap to 1 quart of water