Slide them out of their pots and see what is going on with the roots. May be rot? Or not, but check to see. Roots should be white and firm, not brown and mushy. Hostas in pots like a fast draining mix and garden soil isn't.

-Babka

Even with heavy rains, containers should not get waterlogged. That is an indication that your container soil is not in good conditions or has failed (yes, container soil does wear out and collapses/compacts, making proper drainage problematic). And when drainage is not good, root rots are soon to follow.

We have had the wettest late winter/early spring on record in my area - February broke a 126 year record!! But all my containerized hostas (and all other plants) were out in it and came through fine - because i use a very high quality bark-based potting mix. Drainage is very good and remains like that for at least 3 growing season before it needs to be replaced.

Wow, thank you all! I probably didn't notice this issue since I put them in the containers around June and we didn't have much rain. I will check the roots, amend the soil as necessary and make sure the pots have drain holes (based on the rain we got, I'm guessing they don't and again I didn't notice this last summer since we never got that much rain).

I should add, if I do find signs of rotting, can I save the plants? Anything I can do besides amend the soil and improve drainage?

Use the strong stream from a garden hose to blast off all the old soil and rotted roots, so all off so you are left with is a bare root hosta with nice firm white roots. Give it a dunk in a bucket with 10% bleach for a few minutes. Then a quick rinse and re-pot.

-Babka

Thank you!