Can Foxglove/Digitalis, Marigold, and Lily of the Valley survive a Midwest winter potted outside? ...
Answers: Foxglove is a biennial and it might come back subsequent year- but through its seeds Marigold will not come put money on. Lily of the Valley is a perennial and might come back subsequent year- depends on how long the roots are frozen for. Your best bet is planting the Lily of the Valley in the ground and the foxglove surrounded by the ground for the best chances of them coming pay for.
Not likely surrounded by the upper midwest. Marigold may "volunteer" from seeds subsequent year. Digitalis and lily of the valley would probably trademark it if the plants were surrounded by the ground instead of in pots.