@stone seems to me I don't have a choice! Bog garden it is. I was never going to be able to remove all the framing of the old koi pond nor add enough of the same soil as the rest of the property to fill this big space. I filled the bottom with crushed stone, then a layer of as much clay soil that my yard could spare (maybe 1 foot), then top soil. After a lot of rain and snow recently, it is clear that this will remain wetter than the rest of the gardens.
I'd love to hear anyone's suggestions of what to plant here besides iris, which I will do too.
Thanks, everyone. Ill update once the freezing weather stops and I start to plant.
