yup I used to finish in either 4x4 or 6x6
tinytoon Reviewed by tinytoon on . Root Trimming on in Rockwool I have a few youngsters - about 3 weeks from seed - whose roots are starting to storm through the bottom of the 1" RW cube. My goal is to keep them in the 1" for as long as possible then move them into 4"x4" cubes. To do this, is it safe to trim the roots as they poke through the bottom of the 1"? word, -Colour Rating: 5