So I purchased this house four years ago (before the market went down ) and have two huge forsythia bushes on both sides of the back yard. I personally do not like them, they look OK in the spring time when they first bloom, but the rest of the year they just look like a big mess of green vines. The previous owners obviously never pruned, cut or did anything to them. The forsythia bush on the left has about 4 spurs and 5 for the bush on the right. The first year I pruned them down to the ground in the hope that they would die. Come spring time there they are again. Once again I pruned them and doused them with herbicide. It wasn't anything commercial, just what was available retail at the local Home Depot. It may just be my imagination, but that seemed to help them grow the same year. Into the third year (last year), once again pruned down to grown level in the beginning of spring and dug up as much as possible. I then dumped lime in the holes and covered it with a nice layer of dirt to keep the birds and other animals safe. Now this year they are still around. They are still growing. I've got the rest of my backyard almost perfect with this slight exception. I asked my neighbors landscapers how much they would charge to dig it out. They would not do it since they could not bring heavy machinery into the back yard. There is not ample room on either side of the house for a back hoe. Is there anything I can do to kill these un-killable plants. FYI: I've asked my neighbors in the back of me how old these are. They bought their house in 1991 and these plants can be seen in pictures of their house warming party, so they are at least 17 years old.