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I planted 8 plants (in 4x4 rockwool cubes) in a 4' x 2' bed of hydroton, but I put them too close together... Is it ok to lift them up out of the hydroton and make a new hole and replant them so they are farther away from each other?
I have moved plants in hydroton when the root systems were still small and didn't have a problem. Probably just want to be careful not to damage the root system too much but they can definitely tolerate some abuse. I have read posts from hydro growers who trim their roots to prevent clogging their system and they don't seem to have any issues.
How long ago did you transplant em? If it hasn't been too long, it should be fine, I think. Like Goombah said, the roots can take a bit of abuse before you really start to shock them... just be careful, do it when the lights are off, and you'll be fine...