soo purple

yea i have a plant from seed and the upper parts of the stem is purple on all 3 of my plants anybody know whats up?
 
ive heard cool temps but i honestly dont kno ive seen it alot too i just ignore it now doesnt seem to hurt it
 
ive just been looking somthing to do with temps my temps are 70 day and 40 nite maybe colder on a nite even with lite on, i think its low temps throgh nite, what are your temps dblaze?.
 
Purple stems usually are a sign that there is a lack of phosphorus to the plant. This can be from a nute lockout situation (wrong pH) or a lack of it being supplied to the plant in an another manner such as poor ferts.
 
i had a regular midgrade/bag seed...the stems turned dark purple everywhere and when u squeezed the bud it smelled like grapefruits...it was cool!!
 
maybe it was a g.fruit strain i think ive seen somthing that supp. to give that kind of taste/smell when ive looked throgh the seed indexs.
 
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