Please help

Hi all ! Plants stem and branches are purple and now leaves have yellow on them is this phosphorus deficiency?

The plants look real nice. A couple observations: the leaves you’re pointing out are old fan leaves, which have a finite lifespan. I’d be more concerned if it was more widespread and on younger leaves. The leaves are very dark green, which is normally caused by too much nitrogen. Lastly, the purple could easily be a phenotype. I’m sure they’ll be other opinions.

Ok thanks !!

I see a lot going on there. Please do not take offense as I am just reading the plant.

I see what looks like powdery mildew starting, spider mites, signs of over or underwatering, and deficiencies.

First I would spray the plant with pure water very well. Just rinse it off and see where it goes from there as far as the PM and bugs.

The plant needs food and proper pH. I would feed the plant a healthy dose of bloom nutrient ph'd to 6.3-5. if you have some Epsom salts you may want to spray the plant minus the buds with one teaspoon to one gallon of water for a quick feed of mg.

I would NOT panic the plant looks well into flower and should finish fine. Just do a thorough clean once plant is done flowering.

Thanks for the info