Sure To Grow® Grow Pads & Rolls are Recommended for very short-term hydroponic crops including wheatgrass, sprouts and microgreens which are harvested in less than 21 days. A superior alternative to perlite, coir, vermiculite and soilless mixes. Available in pre-cut pads which fit standard 10” x 20” and 16” x 16” nursery trays and rolls for use in troughs or channels.