Not all plants have the same needs and the right natural fertilizer can make all the difference. 1. Coffee Grounds Roses, Blueberries, Azaleas Boosts acidity, adds nitrogen, and improves soil texture. 2. Crushed Eggshells Tomatoes, Peppers, Zucchini Adds calcium to prevent blossom end rot and strengthens stems. 3. Diluted Milk Squash, Cucumbers, Peas Provides calcium & magnesium, helps prevent powdery mildew. 4. Wood Ash Carrots, Broccoli, Lavender Rich in potassium and trace minerals, balances soil pH. Pro tip: Always use in moderation too much of a good thing can upset soil balance.