This is only a guess but i think its because the soil there prob not watered and its reflecting like crazy, ive seen that when people put alum to shield the roots (in rockwool) from the light but they forget Alum reflects unevenly and you get these what i call punches to the fan leaf. I suggest Water that box in circles what i mean is to a inner circle and the next feed water the outer after 2-4 times you create a nice soil top that dosnt reflect the heat as it absorbs it, thus better root growth too
Now if its HOT (85-99) that Inner circle gonna dry up quick so what i do is water in the morning a inner circle and during high noon the outer.
Same thing happens to my clones if I place them outdoor and dont water the ground first.
Have you got a pic of the whole plant?
With the curling and shit it looks like a touch to much N in my opinion. Not seen it on fan leaves before though.
Are you just giving water?![]()
Looks like a form or mosaic virus or one of its relatives. Usually this is not toooo damaging to MJ plants although it does make them look gnarlly. The virus can be spread by insects, especially the chewing and sucking varieties, plant contact or spread by touching your infected leaves and then touching another leaf which has an injury or opening in the leaf you just touched.
This virus is very common in the typical garden and if you have other plants nearby you can allow this to get out of hand easily. So don't worry too much, just don't handle these leaves more than necessary and keep your insect numbers down.
Good Luck
What kind of dirt is that? It looks like retardation from possible pre-nutrientized dirt!
I have a similar problem with mine. I thought it was from treating them for spider mites with Azamax because it started right after I began using it.... maybe its not??
they're wrinkling & shriveling up like grampa simpson, only green. The curling leaf tips look weird too. Looked around for a while but haven't seen a pic or description that matches these well..
They look a bit more gnarly in person than the pics show.
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l\molybendum deficency also causes weird looking leafs like that from pics i've seen...