Something of an aside, it's hard because winter is so weird now, but I've kept parsley and mint growing in Western MA all winter by covering them with Pyrex bowls from Goodwill. Belatedly, I thought to try this with with rosemary, and the rosemary was dead above ground by then (late December) but might still have life in it. In any case, that's absolutely something I'll keep trying at. Lavender I cover with dismembered Christmas tree parts. In any case if I actually get the artichokes out there and producing, I'm definitely going to try overwintering. If all seven plants make it to October, I can try seven different methods. Planning to start vernalization in a week or so and then get out in individual cold frames, or, likely, under Pyrex bowls, in April. I like those because they're easily deployed and then set aside on the weird warm days we have now. We had a fifty degree day last week.
