Stickanswered grow question 6 years ago Hi there! This looks like a Phosphorous deficiency. You may have a nutrients-lockout in your soil preventing Phosphorous uptake. Overfeeding, overwatering, or wrong pH can result in nutrients-lockout. Do you check your pH? If you don't, I'd recommend to buy a pH-pen asap, they're affordable and this makes a real difference. I'll be around, keep us up-to-date, and happy growing!