Work castings are one of the most effective things you can add to improve the soil of your container or houseplants. Made from the waste left behind from earthworms, these small football shaped grains are rich in nutrients and add structure to your soil. It will loosen up any soil that its put into, improving aeration and drainage which will provide an ideal opportunity for your plant to thrive. These organic soil enrichers bring a lot of beneficial nutrients to your soil, which is good for repotting older plants and starting off seeds. Because it is a completely natural product, worm castings will not burn the roots of your plants like some fertilizers will. Pests like aphids and spider mites are deterred by these castings making this a useful, multi-use and organic way to improve your soil