Photo by Melody

PlantFiles: Bottlebrush, Bottle Brush
Callistemon 'Harkness'

Family: Myrtaceae (mir-TAY-see-ee) (Info)
Genus: Callistemon (kal-lis-STEE-mon) (Info)
Cultivar: Harkness


12-15 ft. (3.6-4.7 m)

12-15 ft. (3.6-4.7 m)

USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:
Full Sun

Unknown - Tell us

Bloom Color:

Bloom Time:
Late Winter/Early Spring
Mid Spring
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall
Mid Winter

Grown for foliage

Other details:
This plant is attractive to bees, butterflies and/or birds
Drought-tolerant; suitable for xeriscaping

Soil pH requirements:
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)

Patent Information:

Propagation Methods:
From woody stem cuttings
From semi-hardwood cuttings
From seed; direct sow after last frost

Seed Collecting:
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

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By Kelli
Thumbnail #1 of Callistemon  by Kelli

By Kelli
Thumbnail #2 of Callistemon  by Kelli

By cactuspatch
Thumbnail #3 of Callistemon  by cactuspatch

By Stake
Thumbnail #4 of Callistemon  by Stake

By Stake
Thumbnail #5 of Callistemon  by Stake

By growin
Thumbnail #6 of Callistemon  by growin

By palmbob
Thumbnail #7 of Callistemon  by palmbob

There are a total of 10 photos.
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2 positives
No neutrals
No negatives

Gardeners' Notes:

Positive Stake On Sep 22, 2009, Stake from Barmera
Australia wrote:

Callistemon "Harkness" or "Gawler Hybrid" sets very little seed and cannot be reliably propagated by this method. The only sure way as with other hybrids is by vegetative reproduction.
This hybrid was in a batch of plants grown by Mr GLH Harkness in 1937 at Gawler Sth Aust. but not reproduced until 1948 when it was recognised as one of the best of all Callistemons and it has not been surpassed since for its ability to produce large numbers of big bottle brush flowers. It is widely used as a street tree in Sth Aust Towns and can attain a height of 20 ft or more but is usually more like 12ft.

Positive southernbeauty On Jun 26, 2007, southernbeauty from Madisonville, LA (Zone 8b) wrote:

There are 34 currently called Callistemon, it is sometimes difficult to tell which genus the species belong to. Bottlebrushes can be found growing from tropical north to temperate south, they often grow in damp or wet conditions, (along creek beds or in areas prone to flooding). the flower spikes can be red or yellow, the flower produces small woody fruit which contains hundreds of tiny seeds, the seeds are usually not released from the fruits for several years, most species are very hardy and will tolerate drought and are low maintenance. Plants grown in full sun produce the best flowers, I have also seen Bottlebrush thrive in Anaheim California, and have always loved the spectacular flowers and the way the birds and insects find it irresistible.


This plant has been said to grow in the following regions:

Tucson, Arizona
Fort Walton Beach, Florida
Lady Lake, Florida
Rincon, Georgia
Madisonville, Louisiana
Tomball, Texas

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