Here in northern New York I have planted brassica mixes for about the past 15 years. It always seems like it’s a crap shoot. Some years it grows thick and tall, some years it barely does anything. Deer definitely love it though, it will draw deer to your property. Winter rye has become my favorite. Easy and cheap to grow, and deer devour it! I have a few 1/2 acre plots with a mix of clovers and chickory that do well. Deer frequent them , but don’t seem to pound them like brassica and winter rye.
