Epanded Perlite is widely used in horticultural applications because of its lightweight form-factor, water-holding capacity, neutral pH, and pathogen-free nature. Perlite is found in the engineered lightweight soils of roof gardens and planters as well as commercial and bagged potting soils. Perlite also functions as a soilless grow media for hydroponics, seed starting and plant rooting. Perlite also makes an excellent conditioner for garden and flower-bed soils, enhancing both the water-handling function and anti-compaction properties.