I'm gonna go out on a limb and guess it was my thread.

Didn't mean to make you paranoid, but wet or damp weed (or even weed that gets too moist from a fruit peel) has a chance of getting moldy. Leave the jar open or put a small piece of tissue in there to absorb moisture. Soon enough, it should be fine. You really only need to worry about this if your weed is noticeably moist, i.e. fog on the inside of the jar.

Fruit peels DO get moldy, though, and mold DOES spread.

Hope this cleared things up.