It looks like it could be a nut thing but like Perp said "that happened in one day?". I don't think the sun can even do that. It might be a late notice on a lack of N, or it might be catching a reflection off of something. check for hot spots.
FreeVenice Reviewed by FreeVenice on . Heat stress? Nute burn? Hello all! This is my first female plant flowering (like 1.5 weeks). I was happy because today the sun came out like it does here in Brazil for the first time since this plant germinated. After some hours of sun i noticed some brown spots on the older leaves that went bigger and bigger during the day, at the final of the day, 3 leaves was like the first pic shows. Im using a spanish nute for cannabis, and giving low dosages cause i think my soil is too strong. Im pretty confused cause it Rating: 5