Well these came from 420 fast buds, they took 3rd place with this strain so I don't think it's genetics. From the very different advice I have gotten (everyone has a different suggestion) from everyone I think it's overwater combined, with poor environment. Where I had it before it dropped down to 51 degrees, before that it was] growing pretty good. Now I have a 4x2x5 grow tent with reflective mylar lining, doubled my exhaust fans and added an air cooler to the system for humidity. If you had seen my previous cardboard grow box setup you would have busted a blood vessel laughing lol.