Rootcubes® growing medium is an engineered hydrophilic foam specifically designed for optimal callus and rapid root development. This cutting propagation medium was designed specifically with the perfect balance of air and water to encourage plant growth and get unrooted cuttings off to a strong start. Rootcubes® growing media contains just the right amount of starter nutrients and are an especially economical propagation media. Rootcubes® allows for rapid nutrient availability without danger of salt accumulation. It is pathogen-free, providing an environment which helps reduce disease and insect problems. Sheets conveniently into a standard 1020 plastic tray. 2 Sheets per box.