James Burghardt
Family
Myrtaceae
Botanical Name
CALLISTEMON rigidus 'Clemson Hardy'(RED CLUSTER)
Plant Common Name
Clemson Hardy Bottlebrush, Red Cluster Bottlebrush
Special Notice
This entry has yet to be reviewed and approved by L2G editors.
General Description
Fuzzy new leaves are light yellow-green and rose but then mature to dark green and stiff on the Red Cluster bottlebrush. Botanical known as 'Clemson Hardy', it is showiest anytime from very late winter into late summer when branch tips have crimson-red spikes of bristled flowers. This evergreen large shrub is native to east-central Australia in Queensland and New South Wales. Its branches are a ghostly gray-beige with mildly corky dark sandy brown bark.
The dark green leaves are stiff and linear to lance-shaped although when first emerging they are fuzzy and light yellow-green with rose-coral blushing. From stem tips will arise a cluster of crimson flowers that lack petals but have long, whisker-like stamens that collectively resemble a bottlebrush. Blooming can start in late winter and spring, depending on warmth of climate), and continue across the summer. Bees and hummingbirds will visit them. After flowering the blooms become woody capsules that remain on the stem and persist for several years. The branch continues to grow from the old flowers and you can trace back the annual growth to the previous flowers' location. Each woody capsule has hundred of seeds inside and often will not release them until very dry, old or a fire occurs. This is an evergreen plant but chillier winter zones may find it deciduous; it does not tolerate continued subfreezing temperatures.
Grow 'Clemson Hardy' in full to partial sun in an fertile but well-draining soil. Tolerating drought, it is its best with some moisture. Avoid heavy or soggy soils and ensure the ground is neither extremely alkaline nor very acidic. Use it as a large shrub for an informal hedge, accent in a mixed subtropical border or foundation bed. It can become somewhat rangy as it ages and becomes a small tree.
Characteristics
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AHS Heat Zone
11 - 6
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USDA Hardiness Zone
7 - 13
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Sunset Zone
H1, H2, 6, 7, 8, 9, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
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Plant Type
Shrub
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Sun Exposure
Full Sun, Partial Sun
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Height
7'-18' / 2.1m - 5.5m
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Width
6'-10' / 1.8m - 3.0m
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Bloom Time
Spring, Late Spring, Early Summer, Summer
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Native To
Australia
Growing Conditions
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Soil pH
Acidic, Neutral, Alkaline
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Soil Drainage
Well Drained
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Soil type
Loam, Sand
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Tolerances
Drought
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Growth Rate
Medium
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Water Requirements
Drought Tolerant, Average Water
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Habit
Upright/Erect
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Seasonal Interest
Spring, Summer
Ornamental Features
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Flower Interest
Showy
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Flower Color
Red, Crimson
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Fruit Color
Sandy Brown
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Foliage Color (Spring)
Green, Purple, Light Green, Yellow Green, Bronze
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Foliage Color (Summer)
Green, Dark Green
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Foliage Color (Fall)
Dark Green
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Foliage Color (Winter)
Dark Green
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Bark Color
Tan, Gray
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Fragrant Flowers
No
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Fragrant Fruit
No
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Fragrant Foliage
Yes
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Bark or Stem Fragrant
No
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Flower Petal Number
Single
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Repeat Bloomer
Yes
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Showy Fruit
Yes
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Edible Fruit
No
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Showy Foliage
Yes
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Foliage Texture
Fine
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Foliage Sheen
Matte
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Evergreen
Yes
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Showy Bark
Yes
Special Characteristics
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Bark Texture
Corky
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Usage
Feature Plant, Mixed Border, Rock Garden / Wall, Screening / Wind Break, Tropical
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Sharp or Has Thorns
No
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Invasive
No
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Attracts
Hummingbirds
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Self-Sowing
Yes
