It can make you sick just by being there

Speaking of camping, or picnicking for that matter, it isn’t wise to set up around manchineel trees - just being around them for prolonged periods of time can cause illness. In fact, some local native people used to tie enemies to the tree and leave them exposed as a form of torture.

Thankfully, these days in many places were the manchineel grows, they are marked by red crosses and warning plaques.