It's hardy in zones 3 through 9. Japanese roof Iris (Iris tectorum) also supports 6-inch-wide, near-tubular white (or lavender) flowers atop its 1-foot-tall green clump. Since its ribbed leaves ...
For example, Iris cristata is hardy to Zone 3, Iris reticulata to Zone 5 and Iris ... Dwarf irises share the same flower and ...