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This plant is said to grow outdoors in the following regions:
Durango, Colorado
Old Saybrook, Connecticut
Washington, Illinois
Belchertown, Massachusetts
Hubbardston, Massachusetts
Sandwich, Massachusetts
WALTERVILLE, Oregon
Wynnewood, Pennsylvania
Tullahoma, Tennessee
Canyon Lake, Texas
Upright, 15-20" tall. True blue flowers from late July into September. Moist well-drained soil in full sun to part shade. ...Read MorePlanted mine late last spring. It only produced a couple of flowers, and many of the stems blackened. I suspect it's in too much shade. A cross between a G. scabra hybrid and a G. makinoi hybrid. Hardy Z3-9.
Upright, 15-20" tall. True blue flowers from late July into September. Moist well-drained soil in full sun to part shade.
...Read More