How large in diameter will the main wisteria get to be? How sturdy does the support next to it have to be growing next to?
Wisteria Vine Diameter
Certified GKH Gardening Expert
These vines can get rather large and require a sturdy support. These articles will help: https://www.gardeningknowhow.com/ornamental/vines/wisteria/growing-wisteria-proper-wisteria-vine-care.htm