Sol Soils offers a variety of high-quality soils, soil components, and soil toppers designed for potted cacti, succulents, and houseplants. We select and hand-mix the best ingredients to produce fast draining soils that help protect against root rot, the number one killer of indoor plants. Chunky Perlite is a large and super lightweight, naturally occurring volcanic glass. When heated to the appropriate temperature during processing, it expands like popcorn. As a soil amendment perlite keeps mixes lighter and allows water to flow through. Popular with many leafy plants and orchids especially.