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Phosphorus deficiency? Week 5 of flowering
microgrowshowstarted grow question 4 years ago
Is this a phosphorus deficiency? I originally saw orange and brown spots form on other leaves, but now I'm seeing blackish/purple spots. I've been having soil pH issues with this one, so may need a proper flush. Temps have also been low the past few days (60-65 but as low as 56)
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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.
RafaelRapidosanswered grow question 4 years ago
Hello microgrowshow,
Brown spots usually tells that it is a magnesium deficiency. It could also be a Potassium overdose. Add some cal-mag and check the runoff with a nutrient ppm meter.
Good luck with your project, I wish you all the best! 👽
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