I was experimenting recently and cut one too low. Having NO CLUE why, I put a little Olivias cloning gel on the exposed core and, to be honest, worked very well from what I can tell thus far. I wish I had a good cam, this plant is now about a foot tall and 15" wide with all secondary growth (only) The nice thing is im also training it so Ive got 6 tops leveled but about 6" between them!