Holly is on our top 10 invasive list. This year over 200 robins at a time visited the tree for about a month, and picked every last red berry clean off the thing. They would sit in neighboring trees watching and waiting for the berries to ripen. Had purple poop all over everything.
Sean, I climbed and brushed out some of it first, then set a highline, which just seemed to make things easier. You can see it in the pic. The long branches were so convoluted, and growing at weird angles. Every branch was a fight.
One thing amazing to me is how a holly leaf can fall to the hard pan dirt underneath and end up sticking straight up by the stem. Then, I can walk by with my 200mph Stihl blower, but the leaf won't budge. I have to reach down a pluck it with my fingers. I can't imagine I would ever plant one of these things on purpose.