photo below is March 2nd, deer feeding in the Winfred. Not sure if they are nibbling the stems, or rotted down leaves, or possibly the rye that died out last summer. The stems have been eaten down pretty good and what's left looks kinda woody and what they've been nibbling on lately seems to be near the ground, so maybe it's the leaves that fell to the ground and froze/rotted under the snow.
this year I am planning to something similar, but with Major Plus Swede (aka, rutabagas). Similar to Winfred in that they are a long season brassica, and the leaves will be similar in nutrient and attractiveness, but the big difference is the bulbs. Larger and sweeter and softer than purple top turnips. I plan to plant at least 2-3 acres in April or May. about 1 to 1.5 pounds (no more) per acre Major Plus Swede with about 125 pounds per acre of winter rye as a weed suppressor and soil builder which I expect to die out in early summer like it did last year, leaving a fairly weed free plot of Swede to grow the rest of summer and early fall. Should provide more mid and late winter/early spring food with those large bulbs. The Winfred is awesome, but we just can't seem to plant enough of it to provide enough forage through the winter. After they got the leaves and most tender parts of the stems eaten up in mid winter, the activity in the plot diminished big time. We would need 4 or 5 acres of Winfred to last most or all winter, but don't have that option now. I'm hoping 2 to 3 acres of the Swedes will provide plenty of food until spring when things green up. Planning to use rye/oats/winter peas for more fall and early winter attraction and probably drop the Winfred from the rotation, not because it's not attractive, but because the Swedes should provide better late winter food source, while the rye/oats/peas provide fall and early winter attraction. They fed in the Winfred all summer, fall, and winter until they got the leaves and most tender stems eaten over, then the amount of feeding in the Winfred decreased a lot. That was probably Late January/early February. Like I said, depending on plot size and deer density, that would vary greatly. We've had years when we planted 5 acres of Winfred and we had great attraction all winter even into March. This year, with less acreage, there was not a lot of activity after Late January/early February because the best parts were eaten up and only the toughest stems were left