Find a great ways to reuse grapevine stalk from the sunflowers as a natural trellis. It will be a great task to recycle tall stalks.
Are you worried about grapevine extending out from the fence into the alley? Do not cut them, because you can support their incessant growth by stalking them from the sunflowers as natural lattice. It is really difficult to handle the stalks, because the clippers are not strong enough to cut their thickness. There is an easy solution to handle them. Just dig a hole to excavate them into the ground and use smaller stalk to cross beam the travel down the vine.
It will surely work because the long stalks and natural color may give a great touch to the artificial structure. It can be a long term solution for your problem. To give support to the leaning plants, you can use some smaller sunflower stalks. You can also try different things to recycle the stalks instead of wasting your money. Your little efforts and creative thinking will make your work easy to maintain and decorate your home garden. Do not forget to share your creative ideas with others to solve their problems too.