Wisteria (Wisteria spp.) is a classic climbing plant, grown for its drooping purple or pink flowers and woody stems that can cover an arbor or grow on the side of a building. Without frequent pruning, these showy plants can become invasive and show up in unwanted areas of the garden, particularly Chinese wisteria (Wisteria chinensis). Even if you cut the wisteria back to the ground, its roots continue to sprout new growth, so you must dig up the roots to get rid of unwanted wisteria.
Cut the wisteria vines back to the base of the plant, leaving about 12 inches of the main stem protruding from the ground. This will give you something to pull on. Place the cut vines and leaves in a garbage bag or garden waste can for disposal.
Dig a wide circle about 2 to 3 feet out from the main stem, using a spade to cut through the roots as you dig. Remove the soil to create a 6-inch-wide trench so you can access the roots. Set the soil aside. Use lopping shears to sever any roots that are too thick to cut with the spade's blade.
Push a round-point shovel into the trench and under the large root ball. Pull back on the shovel handle and use the leverage to pry the roots loose from the soil. Reposition the shovel at various points around the base of the wisteria. Cut through roots that anchor the root ball to the ground.
Pull the wisteria root ball out of the hole. Shake excess soil away from the roots and discard the roots in the garbage bag or can. You might need to use a pruning saw to cut the root ball into smaller sections.
Pull out any large roots left in the soil. Dig out more of the large roots, if needed, so you can pull them out of the ground. Rake through the soil in the hole to pick out any remaining pieces of root. You don't need to remove every tiny root piece, but you should remove as much as possible.
Fill the hole with the reserved soil from the site. Add more topsoil to fill in the hole, if needed.