It must be young because it is moderately small and very few of the buds have bloomed.
These Callistemon around the border of Edison Park will be planted, based on their size and regular arrangement. Scattered along the sides nearby San Gabriel River are plenty of wild juvenile and adult Callistemon, at least some of which are likely the offspring of these Edison Park plants.
Worlds most travelled pohut
Growing along coast foreshore, fruit float on water
Growing out in open, and forest on volcanic ash plain at 1000m elevation.