Offers a revolutionary design and approach to vegetable growing. Unlike Rockwool and Coir slabs. STG Grow Slabs have been proven to work as well or better at only ½ the thickness with greatly enhanced root mass. Each Grow Slab is available in a UV resistant agricultural polyethylene sleeve to enhance growth. They are free of pathogenic organisms and require no pretreatment or further sterilization. The STG Grow Slab is designed to continue the plant growth cycle achieved in the STG Grow Blocks for those crops that have large root masses.