Bottlebrush. Perhaps the hardiest clone enduring single digits with scarcely a whimper. (It may be whimpering but my own wails of despair drown all else out). Evergreen picking up russet tones in winter. Summer fuzzy red flowers on the stems. Deer Proof/drought tolerant.
From the venerable plant at the UW Arboretum comes this promising bottle brush. The plant at the UW has weathered every fluke weather event in the last 20 years and emerged unscathed. Narrowly yet densely upright with pale yellow-white bottle brush flowers and evergreen needley leaves.
Bottlebrush. This is a selected form of the cold hardy species and differs by having 5" bottlebrushes of PURPLE flowers. This would thrive against a hot south wall and will tolerate a range of soils as long as they drain well. Evergreen and so far not munched by deer.