Designed as starter cubes for seed and cutting propagation. They can be used directly into float systems or can be transplanted to either soil or soilless media, as well as into the STG Grow Block for larger plants. The cubes are open celled, water absorbing forms that promote rapid root formation. They are free of pathogenic organisms and require no pretreatment or further sterilization. The physical format of the STG Grow Cubes anchors the plant and provides capillary action for efficient water cooling.