how to make stem thick

are they indoor or out? i herd if you stress the plant a bit by pulling it towars the ground one way with some string tan pull it the oppisit way after a period of time (maybe the next week?) and keep repetting this it will give your stem some girth. It may also be lacking nitrigen
 
use a organic nitrogen.as nitrigen is a must while vegeing because it is what helps the stem and over all growth.
 
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