A-Ok Starter Plugs™ are for starting seeds and rooting cuttings prior to plugging into larger Gro-Blocks™.
The 1.5” size work perfectly in the Gro-Smart tray. The advantage of the Gro-Smart tray is it elevates the plugs above the waterline and ensures good airflow around the plugs. A-Ok plugs come labeled with instructions in a shrink-wrapped sheet that fits a standard 10 x 20 tray (flat). ?The 1.5” A-Ok fits holes in all our Gro-blocks perfectly.