Weed 4 the wife. Blue Cookies. FirstGrow

Hey Growmie, It's a phosphorus deficiency, this is what it looks like in the later stage of the deficiency. flush your plant with clean, pH’d water that contains a regular dose of cannabis-friendly nutrients that includes phosphorus. This will remove any nutrient salts that may be affected by the uptake of phosphorus. Hopefully, I answered your question and remember Happy Growing and Free your mind one puff at a time.