purple plants

my stems on my plants are turning purple. The strain is chocolope and are about 4 - 5 feet tall. using canna cocoa soil. please help thanks

Why are my chocolope plants stems turning purple and some of the leaves are turning yellow and falling off about 4 - 5 feet tall.

What does the rest of the plant look like? Leaves nice & green? Any signs of wilting or curling or anything bad?
Lets see some pics.

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sorry for the bad pictures I had to use my cell phone

:rastasmoke:

The pics aren't bad. Thanks for posting them.
The plants look good, you might want to consider boosting the nitrogen a little.
What kind of nutrients do you give them?
It's normal for the older, lower leaves to eventually turn yellow & fall off as their efficiency declines.
How old are the plants?
What kind of lighting is that?
How much longer until you flower them?

400 w metal halide in a 4 x 4 x 7.5 grow hut side back light t5 flouresent. Two fans one pointing towards the light, and one oscilating fan blowing on the plants. Aswell I have a small intake fan and a humidifier. Hopefully I can keep these as my Mother plants. Nutrients I am using is Flora Nova Grow with synergy, I just got some cal mag to boost the nutrients (just used it once so far), and I just got blood meal but dont know what to do with it. I have 5 more plants in my other room that looks allot healthier. I will post those in a sec I do not know which ones I should use for my mother plants though...

Thank you very much for your reply sorry that I am all over the place.

I will post the details of the second room with the pics...

second grow room has a air cooled reflector with a lumetec 400 w digital ballast metal halide. exhaust 6" vortex.
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thanks for your advice

oh ya they have been veging since june
and I just started to take clones from them,
I am having bad luck with the clones
but I will get it one of these days
just learned a new trick with the zip lock bags instead of my tray dome.