I've been using the same mixture in my plot for years with excellent results.
I have about a 2 acre plot in a little hollow bordering a creek (there is about another 2 acre buffer of scattered brush between the plot and the creek). Every late summer (around this time), I spray the plot to kill it, wait usually until Labor Day weekend to lightly disk it up, then plant it.
My main food source is Buck Forage Oats. I'll drill those in. Then I'll usually lightly broadcast a mixture of alfalfa and ladino clover over the whole thing.
The deer just really tear into those buck oats! The clover mixture gives them a bit of extra browse if they're finicky. It really works great for me and has been my mainstay for several years.
The clover continues to grow throughout the spring & summer. It's usually a bit scattered (not a thick, clean plot) throughout the spring and summer, with some native weeds & tall grasses coming back. It makes for some browse and cover for does and fawns throughout the warm season.
Then I start the whole process over again every August.
We have other food plots scattered about the farm. My brothers plant whatever they want in those. Most often they plant some type of wheat/clover mix. We border a huge river bottom, with hundreds of acres of crops, so maintaining plots through the year isn't that crucial, but having some food source after the crops are harvested as well as a nice green alternative, really seems to help keep 'em in our area.
Chris
