Hoffman 16004 Soils and Ammendments Horticultural Vermiculite, 18 Quarts Provides Aeration And Retains Water Loosens Soil Excellent For Custom Potting Mix Horticultural vermiculite Loosens soil, provides aeration, retains water, can be used to start seeds, propagate cuttings and store bulbs An efficient and popular soil conditioner Can be used to start seeds, propagate cuttings and store bulbs Measures 14-inch in length by 18-inch in width by 5-inch height