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