I have had deer come in, even good bucks the same day I set up a ground blind. One of the best ground blind advice that was given to me is this (and I have experimented with it) -- put up the blind out in the open and don't try to hide it. I know that sounds strange, but think of it like this. If a deer sees it from way off and has a chance to "size it up" as it works its way in, by the time it gets to you, it has already determined that it is not a threat. I have hidden them and used all kinds of foilage and everything you can think of and had deer come in on a trail, turn the corner, see the blind and bolt. Maybe if it is there long enough, they will get used to it, but if you catch them by surprise, you will not get your shot.