Grodan Rockwool Macro Plugs Round w/Slit GP3 Grow Set your desired humidity level

Set your desired humidity level and the controller will activate and deactivate humidifying and dehumidifying equipment appropriately

but you can also get timer boxes that control the lights with total security

supports the plant’s resistance to disease and stress and promotes its inner and outer strength

bulkier buds

sturdy growth and strong root development in seedlings and clones

Grodan Rockwool Macro Plugs Round w/Slit GP3 Grow Set your desired humidity levelMacroPlugs are 1. 5 in round with a slit that allows easy insertion of a cutting. These loose round plugs fit perfectly into the Gro Block hole. For best results, always insert MacroPlugs in a tray with individual cells. The individual cell will make sure the plug stays closed around the stem of your cutting.