Last fall I planted parsnips and carrots. I guess if you plant them at the right time they will grow till winter and then you can keep them in the ground till spring and harvest as needed. It seems that is correct, at least in my area. Although I failed to plant mine early enough because they never got very big. I know you can’t tell from the picture but they are about the size of my thumb. I wish I would have wrote down when I planted them so that this year I could do it earlier but I didn’t. Lesson learned, keep a garden diary.