Volcanic material which expands when heated to create a porous addition to Orchid mixes. It aerates the mixes, and prevents compression of the ingredients of the mix, reducing decomposition time of potting materials. Coarse grade averages 3/8” in size, Extra Coarse averages 5/8”in size.
Sold in 4 cubic foot, and 1.5 cubic foot plastic bags, 8 Quart Box.
