I'm guessing what you have is not Wisteria. . .It would be hard to
think of Wisteria as a weed, especially when in bloom.
Here is an image I found on the net that would illustrate it:
http://www.cuyamaca.net/ohweb/Europe...%205-13-04.jpg
Hope this helps!
Myrl Jeffcoat
http://www.myrljeffcoat.com