lampshade
Well-Known Member
Well normally that a magnesium deficiencey, look it up. Also are they yellowing inbetween the leaf veins or spotting, if so its mag. BUT since you say there are no hairs on the top and its crispy, i would wonder if the leaves are curling up in order to conserve transpired water coming from the leaf surface. When its hot plants "sweat" alot just like us.