My neighbor's flowers

The guy who owns the home here, purchased it for his mom 4 years ago. She past away two years ago and the house has been vacant ever since. The once, beautiful flower garden has been over run with weeds.  I spent two days getting rid of them a year ago, but they came back again this year with no one to tend the garden. The owner is a self employed lineman who has been very busy installing fiber optic cable in all of the neighboring towns, so i rarely see him.  He originally purchased it on a quick claim deed.  He had no idea it had a lien on it which he refuses to pay so selling it has been difficult, since no bank will finance it.   It would be nice to have neighbors again.