Terrafibre Hemp Growing Cubes are an alternative to rockwool， peat moss， or coconut. These growing cubes combine two parts of the industrial hemp plant to provide an ideal growing environment. Bast fibres hold water and provide holds for roots to attach to. Hurd increases air porosity in the cube. Each cube measures approximately 1.5 inches 9 cubes per package Add to garden soil to help break up clay soils and increase water absorption Hemp Fiber Imported Your security is our number one concern