purple stems???is this normal??

my stems are turning purple..is this shit normal??
idk the strain..jus some bagseeds..im thinkin dat its jus da plant maturing but im no expert..

pix will b up when i get outta bed

yeah pics will help. sometimes its a good thing since that is part of a plants genetics, other times it can be a defficiency

it is talked about here: https://www.rollitup.org/general-marijuana-growing/1578-purple-stems.html

My plants had purple streaks on the stems, but I was after they where transplanted...
I though it might have been the strain...but its not. I didn't worry bout them and then they just disapeared

it could be genetics
cold temps
or a deficiency

why the hell do i have 2 threads

heres the pix