3 Simple Homemade Sprays to Keep Garden Pests Away Protect your plants naturally with these easy, effective recipes: 1. Garlic Spray Finely chop 5 cloves of garlic and soak in liter of water for 12 hours. Add 2 teaspoons of dish soap. Strain and dilute with 1 more liter of water. Spray generously on plant leaves. 2. Citrus Infusion Grate the peel of one lemon or orange into liter of boiling water. Let sit for 24 hours, then strain. Spray directly on leaves to repel insects. 3. Vegetable Oil Insecticide Mix 1 cup vegetable oil cup dish soap. Dilute 1 teaspoon of this mix in 1 liter of water. Spray as a natural insect repellent. These methods are eco-friendly, safe for beneficial insects, and avoid harsh chemicals in your garden. Happy growing!