Name: Sandy B. Ford River Twp, Michigan UP (Zone 4b) (Zone 4b-maybe 5a)
Welcome to Garden.org, @stanshap ! Your garden is absolutely beautiful... I think there have been some great suggestions made, and I'm on "team some sort of iris" myself. I hope you will share more photos with us once you decide on what to plant there!
“Think occasionally of the suffering of which you spare yourself the sight." ~ Albert Schweitzer C/F temp conversion