Many of these plants are great for the birds and wildlife which is always a bonus!
I added a link to the
University of Wisconsin's Horticulture page about the Bells of Ireland. I've never tried it in the garden as the seed I started last year died as seedlings due to damping off. I'll be giving it another shot this year. It is said to self-seed if the dried flower stalks are allowed to stay on the plant. That means no cut flowers for the Bells of Ireland! Or at least just a few!