I have two of these lovely plants growing up a trellis in front of our home. But.... there is a lot of dead looking vine underneat and here and there that is unsightly and shows a great deal even with the growth of the two plants. Can I just cut these vines down to about a foot or so tall? I would like to replace the trellis as well as it is 13 years old and getting kind of old and nasty looking.

Thanks

HC