If you want to create a " safe " area for bucks to check the surroundings before stepping out in the open, plant some spruce where you might want them to " hang back " until they feel safe. If you want quick results, get some B & B spruce and plant those. 3 or 4 footers should do it. You don't need a big block of spruce if you have some hinging and natural regen. 5 or 6 trees of that size ( 3-4 ft. ) could be enough to give the deer a little cover to feel safe, combined with your other growth.