If the City does the maintenance, call and find out how they treat them, if it's on private property call the owner and ask who does the upkeep and call them in regard to weird chemicals which is probably unlikely. In the north it is common for people to have apple, oak, pear trees etc. and never harvest. The amount of food wasted is unbelievable when you think about it. There is a documentary called "Meet the Foxes" about how there are wild foxes all over London and other major urban centers in the U.K. Too bad you can't eat them though because naive hippies who think they understand nature feed them cake and shit.