AmnZhzanswered grow question 5 years ago Hi mate it seems like a wind burn to me. Happened to me sometimes some leaves be like that due to genetics, but without the cupping. Any way for elimination purposes I would check the ph of water and of runoff, and if everything is good, I would check if there is a strong wind current where the plant is and change its position. If there is a strong current then make sure it will go around her and not straight on her. When I start feeding (I use Adv. Nutrients) I usually use half of the minimum recommended dosage and go up except Cal Mag.