Natalie said:I never realized how large the roots can get, until my husband recently enlarged my daylily garden. He had to cut into the side of a hill with the tractor, and found huge roots. He said they were from a wild rose bush, but to me, the rose bush was way too far away to have roots that large that were that far way. When it started growing, it was PI! The roots are close to the size of a garden hose! 
I guess that is why pulling it hasn't worked so well here!
they get bigger than that, I assure you. I've taken vines off tress that could hold the weight of several men. Big enough that we disposed of them with a chipper. The main root ball I removed with a Bobcat tractor. Fun day at work, that was...
A trick I've used in the past to kill of hidden root sections is to leave a section of vine above ground, give it a nice fresh cut somewhere, then feed the cut end into a plastic bottle containing a weed killer such as round-up. Just got to make sure no pets or little ones can get at the bottle of poison while it's doing it's work. That piece of vine will carry the herbicide to the rest of the plant and kill it off, though it can take some time.
