Therm-O-Rock - Vermiculite Med/Fine - 3.5 cu. ft.

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Lightweight vermiculite provides superb aeration and moisture retention when mixed in with peat, bark, or compost. Also makes excellent fertilizer. Vermiculite soil supports root structure and stimulates fast root growth. Can be used by itself to aid soil-less hydroponic greenhouses.

Medium/Fine Vermiculite is Grade V3