This is a replacement plug. We recommend using a dedicated tray that is easy to manage. Ideal for seedlings and sprouts Can be used as a transplant plug, both soil and hydroponic. This is a natural seedling plug made from fermented bark and organic materials without soil. For speedy and firm roots you need a culture to maintain the optimum air and water content. Strong and robust root tissue makes the plant grow more active. Rapid routers are very effective to speed up the development of strong roots. Rapid routers are designed to increase more beneficial microorganisms in the plug. This naturally occurring beneficial microorganisms help you build young roots and maximize the nutritional absorption rate of seedlings. Optimal air and water content plugs promote explosive root Use the Rapid Router to develop strong roots faster and achieve explosive plant growth.