smoke24answered grow question 4 years ago This could easily be a P deficiency, getting to mid flower P demand increases, not enough will cause purple petioles and stems, dark green older leaves, necrotic spots with leaves finally twisting, fading and falling off. P deficiency will also cause calcium problems due to how the 2 interact in the plant. I'd flush her good, and give her a feeding with some added P (at the proper ph of course), and see if the symptoms stop spreading. Happy growing.