This very coarse (0.5" - 1" diameter) perlite is a great additive for your plants that require a soil that is porous, and very well draining. It's also a staple in our Aroid Blend Soil. The larger the chunk, the faster the soil will drain. Combined with the right quantities of the right ingredients, like in our proprietary soil blends, anyone can create the right soil for nearly any plant, allowing them to stay healthy and strong, giving you years of good growth.