Flowering for 3 weeks Stems turning "Purple"

[rattlerr]

My female has been flowering for about 3 weeks now and i have noticed that this one branch has started turning purple towards the top, and localized to single branch that is covered in flowers..

I have been feeding her bat guano 3-10-1 and tripling the mixture to 9-30-3 could the problem be the N = 9? or just not enough P?

Thanks for the Help in Advance,

Rattlerr

 

[GTMan]

Many plant stems turn purple, or have purple striping. I find this to be indicative of lower temps or just a normal plant result. Post some pics so we can see