Crimson may or may not survive the winter, depending on where you are in PA. We have wintered some over here in Venango County, but I think it was not 100%. I love the stuff because it smells so good when you mow it...like small burnett. I have not tried it for a quick fall crop, but it is certainly cheap and germinates well. I wondered if it would get large enough to make a contribution...sounds like it can. If it overwinters, it will be the first clover to take off in the early spring...which is a key time of nutritional need for our deer.