Title pretty much sums it up. For some extra details I'm looking for something that will do well planted in pea gravel w/o any clay or soil. It is in a bog so the roots will be wet 100% of the time. I'm looking for something on the smaller side 12-18" tall and wide in zone 7. Evergreen is ideal, but not required. I know this is a very specific/detailed ask so I'm hoping there is at least one fern guru out there. Thank you!