I am aware that there are certain plants that can been used to dissuade certain pests. I have not heard about any that are effective against monkeys. We have a large troupe that live in our area. I have no problem with them passing through, but get a tad annoyed when they forget that my garden is MY garden! Pretty much sure I am fighting a losing battle, given that I am not prepared to perpetuate physical violence, but if anyone knows of more subtle methods to convince them by smell / taste that our garden is not a good area to visit, I would be most appreciative.