Therm-O-Rock Super Coarse Horticultural Vermiculite - 4cu ft - Super Coarse - OMRI® Listed Mushroom Supplies for a food source

for a food source

Increases seedling growth by 35% over the original Horticubes® foam medium

Easy temperature control

Simply break them up and mix with our perfected Select Bulk casing mix in the new grow chamber provided

All Clear Sealer Bags are BPA-free and produced from FDA-approved food-safe materials

Therm-O-Rock Super Coarse Horticultural Vermiculite - 4cu ft - Super Coarse - OMRI® Listed Mushroom Supplies for a food sourceTherm O Rock Vermiculite is a soil additive that uses its accordion like particles to amend soil by retaining water, improving aeration and prolonging nutrient release. Its ability to retain both air and water makes vermiculite ideal for conditioning container soils. Vermiculite can also be used for seed germination, bulb storage and flower arranging. OMRI Listed.