A OK Starter Plugs are designed for the starting of seeds as well as rooting new cuttings prior to placing into the larger Grodan Gro Blacks. These 1.5" plugs are ideal to place into Gro Smart Trays. Advantages of the Gro Smart tray include elevating plugs above water line. Ensures good airflow all around the plugs.
A-OK plugs are labelled with instructions on the outside of the shrink wrapped sheets which fit standard 10 x 20 flat trays. The 1.5" A-OK fits into all of the Gro Block holes perfectly