I think if I were going to overwinter plants in pots, one way to do it would be to sink them into a pile of compost, covering the top of the pot so there isn't a place to collect water. I have seen perennials overwintered this way by a garden center; they are cozy and easy to plant intact the next spring. I bought some pots to try out. I will do some of both, as I had such awful rot this spring with the rhizomes I planted last fall. I want to try a few different things...
