Worm CastingsWorm castings are a natural fertilizer full of organic matter that feeds the beneficial microbes in your soil. Worm castings improve your soil structure so it can retain more water and nutrients, leading to healthier plants. Earthworm Castings can be worked into the soil at the time of planting or can be used as a top dressing for shrubs, flowers, raised gardens or potted plants. Harvey's Worms are created right here in Virginia and can be a