need help why is my plants stem purple?

CK WICKED

Member
well i have 2 clones i have been growing for 3 weeks and dey started out good untill noww the stem is turning purple whats wrong with them?can someone help me please
 
idk about the colder temps.my clones stems turned purple also.my temps are kinda high.its all good
 
well i have other plants growing as well ,i had 4 clones dat are the same 2 of dem i put to flower after 2 week veg and does are doing good the stem of those are green n healthy lookingg. but the other 2 i left veggin for turned red its on its 4th week of veggin i also have 2 other clones i belive they are lemon kush does are doing real good i water them all da same no difference idk why its like dat i have grown this strain before da pic on my avitar was the mother to my clones
 
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