Perlite is very lightweight and great for creating a healthy soil mix. Commonly used with a wide variety of soil blends. Perlite characteristics keep soil from being too compacted. It is a great addition to cannabis plants, among others, because it helps keep oxygen to the roots of the plant. Great for drainage and aeration. Neutral pH. All natural. Won’t decompose or compact. Great for plants requiring levels of high humidity and plants requiring a more porous soil. Great addition for Cactus Soil.