they dont start making thc till the flower cycle, about 1-2 full weeks you will notice hairs in the innernodes
risndeath Reviewed by risndeath on . When do plants develop THC? I was wondering at how many weeks would a plant have THC in them. I have a couple plants that are 3 weeks old that I'm not able to care for anymore, and I can't find anyone to take them off my hands, so I was considering making a small batch of cannabutter from them if they have any THC in them. But like I said, they are only 3 or 4 weeks old and only on their 5th node. It's just bag seed and was an experiment while I was waiting to get my good seeds and complete my grow space. So, does Rating: 5