Grodan Stone wool starter plugs deliver professional-grade propagation performance for seedlings and cuttings. Each cube features optimal air-to-water ratio, promoting vigorous root development and healthy establishment. The 36/40 6/15 format fits standard propagation trays, making them ideal for both commercial growers and serious home gardeners. With 98 pieces per pack, you'll have reliable growing medium for large-scale seed starting or cloning projects. Grodan's proven stone wool technology ensures consistent results season after season.