The reason why you can't use vegetation, dead or alive, is dead trees, logs, that kind of stuff is part of the landscape. You can't alter it to suit your needs while other's would see it as an eyesore. Also, we have species of animals that make their home in dead logs, like wood rats, squirrels, woodpeckers search for food in them.. Live vegetation is illegal for obvious reasons. If you are on private property, use what you like. If you're on public land, you're risking a ticket. Even if you haul brush into public land to use, you better pacl it up. Lastly, even if you sit in the blind but didn't build it, you're the one at fault. Like climbing a tree stand that is nailed into a tree on public land. You didn't build it, but by using it, you're guilty.