Once the soil drops below 50F there’s not much biology to support plants. Having said that, if I leave tiny oxalis plants in the ground over winter, I come out to good size plants in spring. It also depends on whether they get enough light.
I have never left things in the ground after November unless it’s parsnips because the critters will eat them or the ground will freeze down 1 - 2’. The parsnips I dig in December if I can before the ground freezes. They need to freeze to become sweeter.
Great info! Thanks!
What about Jerusalem artichokes? Do you grow those?
Yes, they grow wherever the voles leave the tubers in the garden.