Trumpet Vine And Wisteria . The whole vine is very much toxic. It will eventually produce its gorgeous orange flowers even in partial shade, and hummingbirds adore it. Just Say No to Trumpet Vine Southern Living from www.southernliving.com Chinese wisteria is also invasive in some regions of north america. Its flowers form seeds that drop to the ground, making more vines that do the same thing. Boiling water is effective, but some roots will escape and shoots will regrow.