Hotwired
Well-Known Member
Could some plants develop signs of heat stress at 80 degrees? I am having a problem with my 400 watt MH and leaves starting to curl. As soon as I spotted it I moved the light up about 2 feet and the leaves actually came back and didn't die on me.
New leaves starting growing normally again and the plants grew about 6 inches more in height. Then the same problem started again. Temps at the top of the plants were 80.5 degrees max and 78.5 min. I have some Lemon OG in there along with the OG #18. The Lemon seems to be a little stronger but the #18 has major problems with leaf curl. The MH is at least 40" away from the tops and I can put my hand under the glass without much heat at all.
I'm starting to get frustrated because I can't quite put my finger on the leaf curling issue. All plants are in Fox Farm soil and no feeding has been done at all. They exhibit all signs of heat stress but the temps are in tolerable range. I have no way to lower the temps.
Could something be wrong with the light itself that is causing the leaves to curl? Clueless....
New leaves starting growing normally again and the plants grew about 6 inches more in height. Then the same problem started again. Temps at the top of the plants were 80.5 degrees max and 78.5 min. I have some Lemon OG in there along with the OG #18. The Lemon seems to be a little stronger but the #18 has major problems with leaf curl. The MH is at least 40" away from the tops and I can put my hand under the glass without much heat at all.
I'm starting to get frustrated because I can't quite put my finger on the leaf curling issue. All plants are in Fox Farm soil and no feeding has been done at all. They exhibit all signs of heat stress but the temps are in tolerable range. I have no way to lower the temps.
Could something be wrong with the light itself that is causing the leaves to curl? Clueless....