Trumpet Vine - Invasive even in the north?
I've always known Trumpet Vine to be a great hummingbird attraction but terribly invasive, at least in more southerly areas. What about further north? I'm in northern Michigan, but I'd be interested in hearing from anyone with a similar climate. We are zone 5 (because I'm right on Lake Superior) but summers are short and cool. Last frost date is May 30 and it usually frosts in the fall in early October. Summer highs are normally in the high 70's though it does get much hotter on a few days. For those of you who live in the north and have Trumpet Vine, has it been invasive? Or is it not so bad with the shorter, cooler growing season?