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Interesting Facts

Members of the Callistemon genus are so named because of their inflorescences of flowers. The inflorescences have long stamens and all of the individual flowers are clumped together on the stem. The combination of the clustered flowers and long stamens gives the inflorescence the image of bottlebrush, hence the common name.

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Weeping Bottlebrush   (Callistemon viminalis)

C. viminalis is a shrub or small tree that is fast growing to 20 to 30 feet tall, with a 15 foot wide spread. It bears narrow light green 6 inch leaves.

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Plant Types: Perennial, Tree
Light: Full Sun
Height: 14 feet 11 inches to 25 feet
Width: 14 feet 11 inches to 25 feet
Zones: 9b to 15b
Bloom Color: Red
Bloom Seasons: Early spring, Mid spring, Late spring, Early summer, Mid summer, Late summer
Leaf Color: Green
Special Features: Attracts birds, Naturalizing, Not North American native
Shape: Rounded, Weeping
Fertilizer: Chelated Iron, Miracle-Gro® Water Soluble All Purpose Plant Food
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Plant Care

Can be propagated via rooted cuttings from the stem or from seed.

Plant Growth:

Bottlebrushes are fast growing shrubs and trees. Some plants have pliable branches, which make them a good candidate for an informal hedge. Most bottlebrushes will be severely damaged if temperatures dip below 20°F/-7°C. Grow Callistemon in a shrub border or at the base of a house wall. In areas where Callistemon does not grow hardy, raise plants in a cool greenhouse with a minimum temperature of 35°F (2°C). During the day, set temperatures between 41-50°F (5-10°C), and at night, keep the temperature at 36°F (2°C).


The common name, Bottlebrush, is derived from the inflorescences of flowers on these plants. The densely packed spikes of flowers are arranged along the stem consisting mostly with long, bristle like stamens that give it the look of a bottle brush.

Soil and Irrigation:

Generally tolerant of alkaline soils; however, they will sometimes suffer from chlorosis. Prefers neutral to acidic soil, medium rich with good drainage.


If leaves become chlorotic, apply chelated iron along with a complete light fertilizer to your irrigation water.


Shoots should be trimmed after the flowering period. Remove dead/damaged plant parts in midspring. Tolerates hard pruning.


Spider mites, scale insects, and thornbugs. Other issues include cankers, fungal stem galls, and leaf spots.