Um, I'm not sure... I'd be willing to try it on one or two to see what happens... Worst case scenario, u screw up two, but still have the rest of your pack to depend on... Best case scenario, you yield a little bit more... I'd give it shot... Hell, I've never grown a decent crop that wasn't topped, but then again, I've never grown any autos, either... So, I'm all for topping and making plants big, ol' bushy monsters, which makes me a very happy farmer come harvest day... So, give it hell(only on a couple), and let us know what happens!