When applied regularly, it protects plants without chemical concoctions ... Then add 2-½ tablespoons of mild liquid soap, or liquid dish soap, and 2-½ tablespoons vegetable oil.

Strain the liquid and spray it on plants to deter pests like aphids and caterpillars. 3. Soap Spray: Mix mild liquid soap with water and spray it on plants to suffocate soft-bodied pests like ...