Its flowers are gorgeous but the nature of a wisteria vine is to conquer everything around it. Cascades of lavender or white blooms announce that the vine has woken up after a winter nap and is poised to start climbing once again.
Many people have trained Chinese wisteria, Wisteria chinensis, over an arbor, only to see it attempt to climb the side of their house. Other gardeners prune the vine each year to make a specimen tree-form wisteria but if pruning is neglected the vine will snake across the landscape looking for a vertical surface to climb.
If the wisteria has climbed too far into a tree to reach the leaves with spray, simply sever the main stem. It’s a good idea to spray glyphosate onto the lower cut surface immediately after cutting.
The chemical will be sucked back into the root system for a small distance but I’m positive it won’t kill the entire root mass.
You’ll have to remove sprouts by spraying, clipping or mowing as soon as you spot them for at least three years, thereby eventually starving the roots and killing them.
If you like wisteria blossoms but fear its invasiveness, try American wisteria, Wisteria frutescens. It blooms a bit later than Chinese wisteria but is just attractive.