Aspirin is a remedy for fungal plant problems (black spot, powdery mildew, and rust are a terrible trio of fungi). Dissolve two uncoated aspirin tablets milligrams each) in 1 quart of water and use as a foliar spray to thwart these diseases.
Some effective pest remedies can be found in the kitchen. Always test homemade remedies on a small portion of the plant to make sure they will not harm it, and never apply on a hot or bright sunny day, which could cause plants to burn.
Secret to peppers,Spray the plant with Epsom salts teaspoon dissolved in a spray bottle of warm water (about 4 cups). That gives the pepper plant a boost of magnesium that is required at flowering time to produce fruit. Spray them again 10 days later an
Tomatoes need calcium to achieve their full flavor potential. When planting tomato plants crush up (to powder) about 4 or 5 egg shells and put them in the bottom of the hole. Then plant tomato on top. They'll provide calcium and prevent blossom end rot.