A word of caution about HP. HP will eventually sucker, and is aggressive. However, HP will not grow in the shade, so spreading trees will shade HP out, and HP cuttings planted in the shade will not survive. Deer browse HP! I helped a friend plant 1000 HP and all of them were browsed to death.
HP is a tree when you need a tree.
HP can be planted to form an instant forest
HP makes a screen in one year
HP can be planted to shelter younger trees from exposure to afternoon Sun
HP can be planted to screen a property boundary from neighboring eyes
HP is a disposable tree to create cover while waiting for slower growing trees to establish cover
HP can be planted to connect two wooded areas