Despite the cultural reverence given to mistletoe (especially during the winter holidays) your trees do not feel the same way about such growth. In fact, the mistletoe is basically a parasite whose roots grow into the branch. Not only is it hazardous to the health of your tree, but it also adds unwanted weight to the branch as well. Once rooted, the mistletoe spreads its seeds to nearby trees. If not removed quickly, mistletoe can eventually lead to the death of your tree and to the trees in the surrounding area.