This is the compact Bottlebrush reaching 3′-5′ ( top photo ), the bottom two photos are of the larger form and were taken at Lady Bird Johnson Gardens in Austin. The red flowers are most common, there is also a pink flowering variety.
Protect from cold, it will sometimes return from roots after a frost.
Full sun, possibly drought tolerant once established, opinions vary. It prefers to be in moist soil.
Blooms when weather is warm, loved by butterflies and hummingbirds
Considered an invasive in Florida, also considered to be a good plant for bonsai.
Native to Australia, unclear if it should be in Myrtaceae family or Callistemons.
Propagate by cuttings
Note: I also purchased several traditional Bottlebrushes (Callistemon) and placed them along fences to use to cover the fence. I have some in shade, full sun, a mix of both and dry and wet areas. So far they all seem to be settling in despite the late planting.
These can be kept trimmed as a hedge, let grow up as trees by removing lower branches, or shaped as a topiary.
I’ll add more photos and notes as they grow