The Rapid Rooter is a unique starter plug derived from tree bark. Naturally occurring microbes colonize the root zone providing a good air-to-water ratio for rapid root growth.
This is the same product as 03-2303 without the plastic tray which holds the plugs. As long as you have some way to hold the plugs in place so they can drain properly, this is the product for you. Otherwise, consider purchasing 03-2303 which includes the tray.