My Trumpet Vine had a baby come up about 10 feet from the original vine. I really love this vine, and I always have 3 or 4 Hummingbirds come each summer for the nectar. I have never trimmed or cut it back. I don't even have to water it because the roots go under the sidewalk. The baby has a wasp nest above it, and I need to spray it. Can I cut it back like you can do for a Clematis without hurting it? Then I could just cover it with a garbage bag and spray the wasp nest. It is a huge nest of wasps, so I want to kill them before winter. There are also grapes, but I don't really care if the grape vines die. Any help you can give would be very much appreciated. I really like the Trumpet Vines, so I want to do what is best for them.