Medium Fine Grade Vermiculite - 4 Cubic Foot Bag

This product ships to the contiguous USA only. This product does not ship to PO Boxes.

Medium-Fine sized (Grade A2) horticultural grade vermiculite. Medium-fine sized vermiculite is commonly used as an ingredient in mushroom substrate cakes, such as PF-tek style cakes. The PF tek recipe is: 2 parts fine vermiculite, 1 part brown rice flour, 1 part water.