Well, why did you have it on 12/12 from the start? That might be why it has thin steams.
You could put a fan on it to try to thicken it up.
I have no idea how much your steam will thick. It will probably keep growing at the same rate.
harris7 Reviewed by harris7 on . Is LSTing worth it w/ a small stem? My plant is about 16 inches tall, and i started training it. It is already flowering (has been under 12/12 from the start). The stem of the plant is fairly THIN, is it okay that I'm training it? All the branches that will eventually have buds on it seem to be going in the right direction (straight up, instead of growing out and getting blocked by light) How much will the stem thicken in the last 4 weeks of flowering? IF the bud piles on, will the stem even be able to support it? Rating: 5