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.
A goody from Ian Barclay, this bottlebrush incorporates the showy attributes of the big, flashy red flowers of the tender species into a big shrub that is pretty darned hardy for a lot of our milder PNW gardens. This handles our short dips to the mid teens and perhaps a little colder with age and careful siting. Give it some room - this gets 10x10' or more. Way cool.
One of the hardiest Bottlebrushes to 10F with the added benefit of having red flowers. In growth, this this tends to have graceful arching branches which softens what can sometimes be a rigid look to Callistemon. Not that that is a bad thing but this looks a bit more cuddly. This grows on stream banks in Australia and can take quite wet spots but is also tolerant of dry. Deer proof!
This clone of an already hardy bottlebrush species has been hardier than the typical offering by a few degrees and personally, our most grievous losses have been by a few degrees. This is likely from a higher and more exposed location in Tasmania as it is also more compact than typical and has handled one winter where it went into single digits.
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