Therm-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. 

Therm-O-Rock® Vermiculite Medium #3A is lightweight, moisture and nutrient retentive. Finer texture is suitable for use in germination, plug and rooting mixes.

OMRI® Listed. 

4cu ft bag size / 113 Liters volume.