BANANA PEEL FERTILIZER. Free potassium, phosphorus, and calcium for your garden — from kitchen scraps. Pack peels into a container. Fill with water. Steep 48 hours. Use fresh or overripe peels. Both work. Dilute 1 part peel water to 5 parts water before applying to plants. Use within 72 hours. Apply at the base of tomatoes, peppers, roses, and stra