When you live in 6b and are trying to grow a tall crepe myrtle that doesn’t die back to the ground!

Expecting sub zero temperatures over the next week. I covered my crepe myrtle last winter when the same thing happened and everything leafed out last summer. She’s since grown about two feet taller so I had to get a bit more creative this year. Im hoping this works again! Started with some old lumber I had laying around and made a sort of teepee and staked the wood into the ground. Next I filled in with a bunch of patio furniture cushions for insulation. Finally, I wrapped the whole structure with weed barrier followed by and old tarp I had. All tied together with duck tape and old screws haha.