When we say we are “windowing” bittersweet, we mean something simple. We cut out a section of vine so there is a clear gap, like a window, and the vine is no longer a continuous rope pulling on the tree. That is it. We are not ripping the whole vine off the trunk, and we are not trying to yank the canopy down in one shot.
Why do we window trees covered with bittersweet
Bittersweet is a long game. Most trees that are heavily wrapped do not get “saved” in one visit. The work is usually multiple steps over a few seasons, especially when the tree is fragile, unhealthy, or simply huge.
The town Tree Committee guidance we have been given is to window and not pull. Cut the vine, create that break, and let the dead vine loosen and fall out naturally over a season or two. That approach protects the tree, and it protects the volunteer.
Why we do not pull hard on vines
Sometimes a gentle hand pull works great. You grab a vine, give it a careful tug, and it slides right off. If it comes off easily, fine.
If it resists, stop. Do not swing on it like you are in a Tarzan movie.
Here is why.
First, you can damage the tree. Heavy vines can be embedded, wrapped tight, or fused into bark. Forcing them off can tear bark and create wounds that make a stressed tree even more vulnerable.
Second, the vine mass can be holding dead limbs. Some of those branches are not obvious until you start moving the vines. If you yank hard, you can bring down a whole load of deadwood on your head and end up looking like the Coyote from Road Runner.
Safety and sustainability are the keys.
Why we window this time of year
This is a great time of year to do windowing. We cut and opened the gap now, then came back in spring to check the vine sections. If there is no green anywhere on the vine above the cut, we know we got it.
Some trees, like smaller hemlocks, may let go of the dead vine with a gentle tug later on. Big mature trees seldom do. On the huge trees, we let time and weather do the work after we have cut the vine.
Volunteer safety reminders
Always look up. Always.
Look for limbs hidden in the vine mass. Treat every vine-covered tree like it might be holding dead branches.
Be smart. Be safe.