Therm-O-Rock Super Coarse Horticultural Vermiculite - 4cu ft - Super Coarse - OMRI® Listed Mushroom Supplies and BLOOM base nutrients

and BLOOM base nutrients

adjustable knob controls fan speed

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

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

Maximum output is 75 pints per day

Therm-O-Rock Super Coarse Horticultural Vermiculite - 4cu ft - Super Coarse - OMRI® Listed Mushroom Supplies and BLOOM base nutrientsTherm 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.