Root Crops Alive! All-Natural Fertilizer (6 lbs) All-natural fertilizer provides the extra minerals root crops need to thrive. Use on garlic, onions, beets, carrots, potatoes, turnips and more. Perfectly balanced ratio of phosphorus and plant-based potassium. Apply 2-3 pounds per 100 sq. ft. before planting, or side-dress when plants emerge. For optimal results, apply again in midseason to further boost yields.