Phosphorus

Phosphorus is a component of certain enzymes and proteins, adenosine triphosphate (ATP), ribonucleic acids (RNA), deoxyribonucleic acids (DNA) and phytin. ATP is involved in various energy transfer reactions, and RNA and DNA are components of genetic information.

Phosphorus (P) deficiency

(P) deficiency during flowering. Fan leaves are dark green or red/purple, and may turn yellow. Leaves may curl under, go brown and die. Small-formed buds are another main symptom.

Phosphorus deficiencies exhibit slow growing, weak and stunted plants with dark green or purple pigmentation in older leaves and stems.

Some deficiency during flowering is normal, but too much shouldn't be tolerated. Red petioles and stems are a normal, genetic characteristic for many varieties, plus it can also be a co-symptom of N, K, and Mg-deficiencies, so red stems are not a foolproof sign of P-deficiency. Too much P can lead to iron deficiency.

Purpling: accumulation of anthocyanin pigments; causes an overall dark green color with a purple, red, or blue tint, and is the common sign of phosphate deficiency. Some plant species and varieties respond to phosphate deficiency by yellowing instead of purpling. Purpling is natural to some healthy ornamentals.

I would say give it a couple weeks. The heat can bring this on as a stress. if its still there after that I would see how it is effecting the plant at the time. The heat can cause rapid growth giving you a short term problem. I wouldn't panic.
Bloomin Idiot Reviewed by Bloomin Idiot on . Not Purple Bud, Nore is it cold!! Why Purple, Fungus, Early Sign Of Bud Rot? How you doing folks, im in some need of some real help, my outside girls "all sexed" are all just now starting to flower, pre flowers on some.. 2 to 3 weeks ago i notice on one plant inbetween shoots there was a purple like color forming, in quite a bit of shoots all that plant as a mater of fact.. over the next couple days i started to check the rest of the plants top to bottum and notice that its on them as well, not all are as bad as the first but i can see more and more everyday.. I know Rating: 5