Organic Potato Fertilizer 3 lbs. Organic Potato Fertilizer All-Natural & Non-GMO Sourced Potato Fertilizer (3-6-6). 3 lbs. will feed 30 potato plants for an entire season. Guaranteed to increase yields, size, health and vigor of your potato plants. Derived from: Fish Bone Meal, Gypsum, Blood Meal, Alfalfa Meal, Sulfate of Potash & Feather Meal.