If they are turning yellow and curling and are slightly wrinkeled then it's heat stress in which case you need to back your light up and spray your foliar feed during dark hours only, foliar feeding is kinda hard to do. Also, the problem could very well be a Magnesium defieciency, if the new leaves curl without any yellowing use epsom salts, the problem should appear to be fixed within four new node growths. My grow has examples of light stress on my largest plant, follow the link in my sig and you'll see what it looks like
Specialist Reviewed by Specialist on . foliar feeding I hear that if the concentration of a foliar nutrient feeding is too strong, it will cause the leafs to curl sorta sideways (not under). This is happening to my plants (I am using advanced nutrients 'growth excell' which is some sorta seaweed extract), but only the newer leaves are curling like that. Is there any way I can foliar feed my plants without fucking up the newest leaves? Other than the new leaves becoming deformed, the rest of the plant loves it! Thanks, any help would be Rating: 5