Medium Grade Vermiculite - 4 Cubic Foot Bag

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

Medium sized (Grade A2) horticultural grade vermiculite. Medium 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 medium vermiculite, 1 part brown rice flour, 1 part H2O.