If I grew in the backyard in my country...Oz...I would go to jail...guaranteed.
bury him alive in his own yard to teach him a lesson for being a snitch.
just a suggestion, no way to know your exact situation but..
If this guys a old farmer and is bitching about how part of your yard is unkept, mabey make the offer that he can plant it up with whatever produce he is growing... bet that would cool the tensions a bit, and make less upkeep for you. Win Win