Cultiwool Starter Plugs - 1.5"Cultiwool Starter Plugs high quality rockwool grow medium They are perfect for transplanting to bigger grow blocks as your seed or clone grows. The uniformity and direction of the fibers facilitate strong root structure as they create the ideal level of resistance for the roots to grow into. Cultiwool manages the entire process of rockwool production from the melting of the basalt to the end product germination plugs or growing blocks ensuring a