Overwintering lily of the valley once it’s dug up

Question

How do I store the rhizomes until they can be planted? Keep in a pot of
soil or let them air dry?

Answer 1

Although they are a rhizome and not a true bulb, they can be stored like one. This article will give you more detail on storing flower roots for the winter:

https://www.gardeningknowhow.com/ornamental/bulbs/bgen/flower-bulb-shelf-life.htm