Viagrow earthworm Castings are an all-natural, soil amendment, ideal for all growers. Viagrow earth worm castings are sourced from only the finest of earth worm farms where the worms are fed a nutrient rich diet of ingredients resulting in perhaps the best soil enhancer on earth. Adding a small amount of earth worm castings into the soil or planting mix for your plants, fruits, vegetables, herbs, grasses / lawn, medical plants and trees will yield big results. Viagrow worm castings are all natural, sustainable and have no odor and are great for all indoor and outdoor plants