Growstone GPGS1 Soil, 1.5 cu. ft, Green Growstone gs-1 Hydro stones is the perfect growing Media for vegetables, herbs, fruit and flowering plantsfrom lettuce and basil, to tomatoes, cucumbers, strawberries, Gerbera daisies and orchids. It can be used in hydroponic systems as simple as manually irrigated containers, or as advanced as automatically drip irrigated containers, ebb-flow systems, and NFT tables.