My next door neighbor (in a residential neighborhood) has a large crop of Canada thistle in their front, side, and back yards that are 3-5 feet tall and in full bloom. I have spoken to them three times about cutting them down and even provided them with U of M Extension handouts about the thistle. They tell me that they have a different perspective and don't see the thistles as weeds. I have also emailed the person in charge of Goodhue County noxious weeds but have received no response. Thistles have spread into my yard and gardens already, but I would like to prevent all of the neighbors' plants from spreading their prolific seeds both my way and around the neighborhood. What else can I do to get them to control their thistles? Thanks for any help you can provide.