I don't have anyone I'm afraid, but as a long-time wistaria custodian I can tell you that the plant will put on vigorous growth all summer - if you're lucky it will also flower two or even three times. However the long, whippy new tendrils will also need cutting back on an almost constant basis if you want to stay on top of it so it's not a one-off job. It also needs hard pruning (back to about 2 or 3 buds) during the winter. Obviously accessibility can be a problem so it might be worth reducing it in size so that in future you can do the job yourself. Good luck in your search.
Bruce Hammal ● 1954d