Grodan Macro Plugs have a slit that allows for easy insertion of a cutting. These loose 1.5in round plugs fit perfectly into the Gro-Block hole and Grodan Starter Tray.

For best results with these Grodan Macro Plugs always insert them in a tray with individual cells, such as the Grodan Starter Tray. The individual cell will make sure the plug stays closed around the stem of your cutting.