My best plots of Winfred was when I seeded it with rye as a cover crop to suppress weeds. When planted in mid May to mid June, the rye gets established quickly and suppresses weeds while the Winfred gets going. The rye and Winfred reach about 12" tall nearly the same time and then the rye sort of fizzles out and the Winfred really shoots up about the same time, in Mid summer. Winfred never gets "too mature" so yes, the chest hi Winfred was devoured by deer. They ate that stuff down to nearly the dirt. The stems get as big as a man's thumb or slightly larger on Winfred that size, and the deer will eat the stem down to within a few inches of the dirt. I've seen groups of deer eating the stems in early to mid April after they devoured everything of the Winfred besides the stems near the ground while alfalfa and clover was already getting green in adjacent plots in early to mid April.
If you are ok with using chemical on your food plots, the best way would be to either no till, or lightly till and allow the first flush of weeds to come up for a couple weeks in early spring. Once the weeds get a few inches tall, spray them with roundup and the next day either just broadcast the Winfred, or drop seed it with a grain drill or Brillion seeder, or use a no till drill but only get the seed planted 1/4" or so like alfalfa or clover. The Winfred will germinate quickly with the next rain and it will be weed free when seeded after killing the first flush of weeds in the spring. We do not like to used chemicals on our plots, so that is why I use rye to suppress the weeds. But I think the results would be taller and thicker Winfred if a person killed the weeds with roundup and then seeded the Winfred. It grows really quick and tall, so any weeds that might germinate several weeks after you spray the weeds and plant the Winfred will quickly be shaded out by the Winfred as it forms a canopy. 3 pounds per acre of Winfred is plenty for a solid stand. I like to add purple top turnips and use about 2 pounds of Winfred and 2 pounds of PTT per acre