What diameter rope did you use? Or is just unraveled some? This looks like exactly what I need to make…Here's a video of the vine suspension. At the end I jostle the branch with my hand to demonstrate how loose it is at the base.
I used polypropylene rope, dipped in a silicone and xylene mixture (xylene was used to prevent the silicone from skinning over too quickly), and rolled in peat moss. You can see that most of the peat has worn off, but algae/moss/mold has kept it looking fairly natural. The rope runs through a hole in the glass with a knot and silicone at the end.