Callistemon sieberi
River Bottlebrush
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River Bottlebrush (Callistemon sieberi) - Description
C. sieberi is a shrub that grows to heights of 3 to 6 feet tall and wide. It bears small 1.5 inch long dark green leaves which densely cover branches. It bears cream to yellow flowers in 1.5 to 6 inch long brushes appear from late spring to mid-summer.
River Bottlebrush (Callistemon sieberi) - Blooming
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.
River Bottlebrush (Callistemon sieberi) - 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).
River Bottlebrush (Callistemon sieberi) - Planting
Can be propagated via rooted cuttings from the stem or from seed.
River Bottlebrush (Callistemon sieberi) - Pest
Spider mites, scale insects, and thornbugs. Other issues include cankers, fungal stem galls, and leaf spots.
River Bottlebrush (Callistemon sieberi) - 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.
River Bottlebrush (Callistemon sieberi) - 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.
