Macroplugs have a slit that allows for easy insertion of a cutting or bare-root plant. These round plugs fit perfectly into Grodan Gro-Blocks™. For best results with these Macroplugs always insert them in the GRODAN Gro-Smart tray. The individual cells will make sure that the plugs stay closed around the stem of your cutting. Macroplugs can also be inserted into pebbles or any other growing medium. Macroplugs come in a convenient 50 count bag.