I've read some confusing information on Purple Sprouting Broccoli. I received some seeds in trade. I started some seeds the end of March. I just planted out a few seedlings yesterday. Do they mature in 200 days? or 60 days? Are they suppose to overwinter before they form heads or can I grow them this season? How would I overwinter broccoli when our winters can get down to -20 degrees F?

Thanks so much for any help!