WHat you should do, is make a few small nicks up along the stem that will be underground soil after topping up, and rub some rooting hormone gel onto it, it will help giv the plant extra momentum in getting new roots started, but Just have your lights off for a few hours each day instead of 24/0 because roots tend to grow more in the dark, the energy of growing from the top of the plant becomes a little more concentrated down below.

Hence why some people swear by 18-22 hours of light.
jonny Reviewed by jonny on . bigger roots ok my question is (may sound a bit stupid but you'll get it once i execute this experiment) if you grew a plant could you get the whole main stem to root if you filled in more soil? Rating: 5