Perlite for Plants - 15QT Organic Perlite Bulk for Indoor Plants, Succulents, Vegetables, Garden, Horticultural Perlite for Soil, Potting Soil Mix, Root Cuttings, Seed Starting…Brand: wyevee Color: Perlite Features: FunctionPerlite occurs naturally in volcanic rocks, which expands and turns porous mineral perlite granule when it's heated up. In horticulture, perlite bulk can be used as a soil addition or alone as a medium for hydroponics or for starting cuttings, rooting and sprouting. ApplicationPerlites are always used as a potting mix, garden soil mix, rooting medium, seed starter, soil conditioner, topsoil, top dressing,