Vermiculite Clean and sterile, good air permeability, water retention, and fertilizer retention! The vermiculite ore is fired at a high temperature of 1000 ℃, and the volume expands more than 10 times. It has a layered structure, light weight, good ventilation, water retention and fertilizer retention. Odorless and harmless clean cultivated substrate made of high temperature firing. Mostly used for sowing, cuttings, potted plants and reptile beddings