I own a few acres of land in a community garden were I plan to grow some of the hottest chilis in the world. The community garden is clearly marked as private property and fenced in. However the gates are not locked and can be opened by anyone. As a matter of fact the community garden plots are near a popular hiking and jogging track and it is a well known "secret" that random people regularly walk through the gardens - which is not a big deal. However it is sadly also known that a good amount of people seem to think we dont mind if you pick an apple or two, some strawberries or whatever - this is a whole different topic.
The chilis I am growing - in terms of hotness - can cause damage to ones health (sensitive body parts like eyes, heart attacks, ...) if handled improperly.
According to the description above it seems to me that the trespassers that are just walking through can be considered innocent without criminal intent and in that role will also not be affected by the chilis. As far as I know it is also not an "attractive nuisance" for animals (chili plants evolved to be a literal unattractive nuisance) or children (fruits, vegetables and so on are not a primary target) running around unaccompanied. Which leaves me with the people stealing fruits from my garden. Is picking fruits/vegetables from private property already enough to be considered criminal intent which would mean I am not liable?
While my location is Switzerland I think this might also be interesting for other countries. Therefore some common law or US interpration would also be interesting to hear.