Worm castings are a nutrient-rich soil amendment that can be used to boost the growth of your plants. Made from the natural process of worms digesting organic material, worm castings provide a plethora of benefits to your garden. Worm castings contain beneficial microbes and fungi, plant-available nutrients, and an excellent structure that holds moisture and air. Worm castings are an organic alternative to synthetic fertilizers, and can be used as a top dressing, or incorporated into the soil in order to improve soil structure and fertility. Worm castings are an excellent source of nitrogen, potassium, and phosphorous, and can help your plants ward off diseases and pests. The benefits of using worm castings are many, and include increased root growth, improved water and nutrient holding capacity, improved soil tilth and structure, increased microbial activity, and enhanced plant health and vigor.