Yellow Iris: Zone 4 and up. Grows good and sizable. Grow at a pond side bog, as back drop, pond shade, or better yet as a island earth hump. One way with a wide tub set in the water, with top lip JUST below water surface ... then hump of soil layered over with sod ... make divot and insert Pod.
Sold / Plant as pod.
Yellow Iris: Prohibited Invasive Plant List ...no good in CT, ID, IL, IN, MA, MN, MT, NY, OR, VT and WA.