purple vs green stems

i have my 2 beautiful 6 day old plants growing side by side and i noticed the smaller ones stem is light green and the larger one growing has a purple stem, i was wondering what that meant, fem or male?
 
no not f/m
Stem color could come from a different strain/or just genes.
Probably dif strain is all...hope i helped
sometimes can be a def.
Are they different?
 
well i really have no clue what they are i had 2 sacs last night one was jackfrost and the other was purps but i never get bagseeds, escpecially not 1 from each bag
 
The little white things are perlite, i wouldn't really worry about the purple stems as long as everything else seems okays..
 
Older small thin stems can turn red, brown, tan and everything in between, when the same strain stem is getting green its growing fast, the new growth is green and is pushing its way out of the old stem so you will start to see streaks of green down the stems as they grow. Sounds like your lil ones are growing thicker faster than the tall ones.
 
The little one is just now hitting a growth spurt and will purple too after it catches up to the light and slows down "IF the strain usually grows purp stems"
 
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