The following was received via email: I am questioning our method of using wire to support the trunks of our wisterias. Could the wire be harming them? Here are the situations: A wisteria sinensis in place since 1996 twined up wire to reach a supporting arbour. It has always flowered beautifully, and the leaves look good. However, it is very small for its age, and for the last 2 years the new growth shoots have died. (If the wire isn't the problem, I suspect that the poorly drained soil could be.) We lost a wisteria on the front of the house, also trained up wire to a pergola. A clematis armandii overran it, but I am wondering if that would have been the likely cause of death. Inspired by the Asian garden, we have planted wisteria 'Snow Showers' up a doug. fir that has been limbed way up. We planted the wisteria about 18' from the tree, and installed a wire for it to make the trip to the tree about 6' up the fir. I have allowed 2 wisteria main stems, one much bigger, to twine up, and we are tattaching 3 main leaders gently into the bark of the fir with U tacks. Should I leave the wire supporting the wisteria trunk up to the fir tree, or get it out before it gets grown into the trunk of the wisteria.? How do you affix your wisteria leaders as they climb up the fir trees at UBC?