Perlite 8 Quart Bag This popular growing media is made from expanded volcanic rock. Perlite not only works as a growing media for indoor gardening but also helps to loosen heavy soils and improves outdoor gardens. Perlite works well for improving gardens, growing plants, starting seeds and it doesn’t degrade.
Perlite ore is a naturally occurring volcanic glass containing a small percentage of water. Perlite is created naturally by the hydration of obsidian. The obsidian ore is superheated in a furnace and popped like popcorn, then sifted to grade the size of crushed chunks. This amazing and versatile light-weight media has a tremendous surface area and the ability to retain a balance of air and moisture.