Can anyone suggest a plant to grow under Elephant Ears that doesn't mind having wet roots?

Every year I grow elephant ears. I love them but I have a problem growing anything underneath them. They grow against a fence, so between the fence and the large leaves (lots of shade), and wet soil (which elephant ears need), I can’t find anything that will survive underneath them.

I would love something that will flower and won’t grow taller than about a 12 to 18 inches. The stalk always looks bare around it once the plant reaches it’s 6 foot height.

I’m alright with non flowering as well, but I would like something full. My elephant ears usually last from May till mid October. So it would be nice to have the plants under it last that long as well. My zone is 7A. Please attach links if possible.

I’ve looked everywhere but I can’t seem to find anything, that meets all the requirements.
Summary,
Bushy
12–18 inches
With or without flowers
May – October life span
Damp soil
under shade, only with afternoon sun