Redish Stems (leaf)

WaTzRelLyGoOd

Active Member
i have a bunch of plants and they get the same food (Shultz20-30-20 once every 2 weeks)and same lighting as the rest but some of my plants stems(only some) are redish brown. i read a article about it being some sort of defiency or they only talked about it when they were young. these plants mature i believe there about 18 inches tall and i started flowering them already. i dont have a good picture sine my camera sucks but here is them all. also on another subject how much does anyne think i will harvest from all these plants?
 

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