Photo by Melody

PlantFiles: Red Cluster Bottlebrush Tree
Callistemon rigidus 'Clemson Hardy'

Family: Myrtaceae (mir-TAY-see-ee) (Info)
Genus: Callistemon (kal-lis-STEE-mon) (Info)
Species: rigidus (RIG-ih-dus) (Info)
Cultivar: Clemson Hardy
Additional cultivar information: (aka Clemson Hardy Red Clusters)

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One member has or wants this plant for trade.


10-12 ft. (3-3.6 m)

6-8 ft. (1.8-2.4 m)

USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)
USDA Zone 10a: to -1.1 C (30 F)
USDA Zone 10b: to 1.7 C (35 F)
USDA Zone 11: above 4.5 C (40 F)

Sun Exposure:
Full Sun

Unknown - Tell us

Bloom Color:

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

Grown for foliage

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

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:
Unknown - Tell us

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

Seed Collecting:
Unblemished fruit must be significantly overripe before harvesting seed; clean and dry seeds

Click thumbnail
to view:

By donnacreation
Thumbnail #1 of Callistemon rigidus by donnacreation

By donnacreation
Thumbnail #2 of Callistemon rigidus by donnacreation


No positives
No neutrals
1 negative

Gardeners' Notes:

Negative donnacreation On Aug 31, 2011, donnacreation from Sumter, SC (Zone 8a) wrote:

I bought 3 BB's labeled "Clemson Hardy" at Lowes, but they don't have the characteristic colors of rigidus on their new growth, and they were grown in S Fl. Will definitely keep my receipt!

Update, I planted one specimen last summer, and it got through a 'mild' winter last year with only minor leaf burn. Still don't know if this BB can make it through a colder than normal winter, which is being forecast for winter 2013. Stay tuned..

Update 2014: Winter 2013 was also mild, and my BB grew and bloomed beautifully. Winter 2014 has been quite cold with many hrs in the teens, and all of my 'hardy' BB's are toast. They will probably grow back from the roots - very disappointing. This BB is only hardy to about 20f.

Woodlander's Red is the only BB that's bullet proof in central SC.


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

Punta Gorda, Florida
Newberry, South Carolina
Austin, Texas

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