y is my plants stem purple?

[Kb420Kb]

here is a pic

[whisky]

i think this was some sort of nutrient defficiency phosforus i think
check this out Marijuana Plant Abuse (http://greenmanspage.com/guides/plant_abuse.html)

[Gatekeeper777]

all mine started out like that.
I hit them with some poo tea once a day for a week and it went away.