Decided to use just grow cubes as experiment. So planted seeds into pots filled with these cellmax 1cm cubes. Plants grew very well for 4 weeks, then Big Trouble, plants started to slow and not thrive at all. So after investigating discovered that these cubes where completely Infested with root mites, so I checked the bag that still had some left over cubes, looked at them through microscope and there they were, completely infested with the buggers......My fault for not being diligent enough.....only managed to save one Plant and had to discard the others..so placed the saved plant in the ground outside which is now thriving...cleaned out grow closet and started again using soil plants now thriving......So be careful when using rockwall.........X