I have "fed" staghorn ferns pieces of banana peels for several decades and still do so frequently. I have never seen the slightest bit of problem in doing so. In fact, sugar ants sometime take up residence in my stags while they are outside, and believe me, the peels don't bother the ants one iota. I grow a lot of staghorns each year........a lot.
I am not saying the peels are not sprayed (the vast majority of our fruit and vegetables are), but I have a feeling the USDA would have a say about what's being spayed on crops that are imported to America. Just my thoughts here, and they are worth what one pays for them.
