They will lay up in any thick cover that's available to them. Around home, they'll bed a lot in 4-5 ft. tall canary grass or in CRP tall prairie or switch grass fields. My feeling is that 3-4 ft. tall may not be enough to provide substantial cover. If the wind knocks it down a little and there's not much left. I'm sure you'll get some deer in there. But I think you can do better with a taller variety.