Hoffman Vermiculite 18 qt. Catalog Lawn & Garden Soil Soil Conditioners Hoffman Vermiculite 18 qt. Manufacturer : Hoffman A H Inc | Good Earth Description An efficient and popular soil conditioner (gold color) Loosens clay soil, provides aeration & retains water Can be used to start seeds, propagate cuttings and store bulbs Blend with peat moss & perlite for a custom soilless mix Rates Please contact us for current pricing and availability.