Perlite is a volcanic glass that is heated to 1,600 degrees F. (871 C.) because of which it expands to 13 times its former size, resulting in an incredibly lightweight material. Perlite is used in soil mixes (including soilless mediums) to improve aeration and modify the soil substructure, keeping it loose, well-draining and defying compaction. A premium mix of one part loam, one part peat moss, and one part perlite is optimum for container growing, enabling the pot to hold just enough water and oxygen

Perlite is a volcanic glass that is heated to 1,600 degrees F. (871 C.) because of which it expands to 13 times its former size, resulting in an incredibly lightweight material. Perlite is used in soil mixes (including soilless mediums) to improve aeration and modify the soil substructure, keeping it loose, well-draining and defying compaction. A premium mix of one part loam, one part peat moss, and one part perlite is optimum for container growing, enabling the pot to hold just enough water and oxygen