first thing i would check for is pests like spider mites under the leaves.
that's what they called me.............nope no problems with mites hmm could it be a bad seed??
there are NO mites what so ever no BUGS there are little green like spots in the leafs im really at a lose about what it could be ive flushed for 1 day and i also fed with no nuts for 1 week..... plz anyone else kno if its even a problem or notTetranychus urticae............my vote
i would be worried about it. is it just the 1 plant that is affected or is that all you have is 1?
i am still leaning towards a pest problem, but its hard to say without having the plant in front of me to look for myself.
did you use a magnifier to look all under the leaves and such?
its been a week since you posted your problem.
has the problem gotten worse? have the leaves that were affected gotten worse?
has it spread to other plants?
can you post any updated pics?
what are you feeding them?
I know you have answered this question a bunch but just to be sure; have you checked the underside of the leaves with a 30x microscope?