Super Sprouter Perfect Plug Refill Pack (50/Bag) Super Sprouter Perfect Plug brand growing media replacement plugs are great for seed starting and cuttings Perfect Plug brand growing media plugs use a custom peat moss blend, with Mother Earth BioChar added, exclusively developed for Super Sprouter to allow a great mixture of moisture and aeration Perfect Plug media plugs have a pre drilled dibble to foster the optimum environment for stem to media contact