Stickanswered grow question 6 years ago Hi there! This looks like a Boron deficiency. This is not a common thing! This may come from : 1) Incorrect pH and/or pH fluctuations. 2) Poor nutrients intakes. Are you watering with reverse osmosis? 3) Too much humidity resulting in a lockout, roots can't absorb Boron anymore. As for a solution to help her recover, you can mix a teaspoon of boric acid in 4 liters of water, and see how it goes. I'll be around, keep us up-to-date, and happy growing!