Having read Dom's post of his new house and the trouble he had with the neighbors I had to post this.
First of all this is in Oregon, so the laws may be different where you live.
A guy (John) owned 2 acres of prime dirt on a lake here in Oregon. One day a new couple (Ted) moved in from California and took up residence
next to his property. Things went along normal for a little while when one day Ted was out mowing the weeds down on his property. He looked
over at John and asked him if he would like the weeds mowed on his side since he was there. John said okay. So John didn't do much about
mowing the weeds down on the edge of his property, but did mow the grass up by the house and down to the lake. But he would see Ted out
every now and then mowing the weeds down on the edge of his property. He always thanked him, and Ted would wave.
After a year of this, John received notice that since he hadn't taken care of his property, a section had been deeded to his neighbor who had been
doing the cleanup work, mowing and trimming on his section for over a year. By Oregon law, this is true. A property owner who fails to maintain
the property in a clean state, can have the property taken away from him if another landowner has had to maintain that property for over a year.
John tried to fight it, saying the guy would mow it for him because he thought he was nice. He lost. John was 73 years old. He thought it was Ted being
a nice neighbor. Later on Ted built a boat house and dock on that section he took from John.
So the rule is, never let your neighbor mow your lawn.