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1.Callistemon — Overview
Callistemon citrinus, commonly known as Crimson Bottlebrush, is an iconic evergreen shrub or small tree. It is native to the southeastern regions of Australia, particularly New South Wales and Victoria. Its taxonomic journey began with William Curtis in 1794, who first described it as Metrosideros citrina.
Later, botanists reclassified it into the genus Callistemon. The genus name 'Callistemon' comes from the ancient Greek words 'kallos' (beauty) and 'stemon' (stamen). The name fits its striking, brush-like flowers, which vibrant, showy stamens dominate.
The species epithet 'citrinus' refers to the distinct lemon-like aroma that the leaves release when crushed, a scent that comes from its rich essential oil composition.
Botanically, Callistemon citrinus usually grows as a dense, multi-stemmed shrub between 1 and 3 meters tall. Under optimal cultivation, it can mature into a small tree reaching 5 to 10 meters. Its leaves are lanceolate to narrowly ovate, firm, and dark green, measuring about 3 to 7 cm long and 5 to 8 mm wide. Prominent oil glands dot these leaves and appear as translucent points when held against light.
The plant's most notable feature is its inflorescence: dense, cylindrical spikes of flowers that strikingly resemble a bottle brush. These crimson-red spikes are typically 6 to 10 cm long and 4 to 7 cm in diameter. Numerous long, brightly colored stamens form most of each spike. Crimson is most common, but horticultural cultivars also appear in pink, purple, or white.
Flowering occurs mainly from spring to early summer, though sporadic blooms can appear throughout the year in favorable climates. After flowering, woody, cup-shaped capsules develop and hold numerous tiny seeds. They persist on the branches for extended periods.
Trusted Scientific References
Authoritative external sources for Callistemon citrinus:
1.1.Callistemon — Key Features
- Botanical Name — Callistemon citrinus (Curtis) Skeels.
- Common Name — Crimson Bottlebrush.
- Plant Family — Myrtaceae.
- Native Origin — Southeastern Australia.
- Distinctive Feature — Striking, brush-like crimson-red flowers.
- Leaf Characteristic — Lemon-scented when crushed due to essential oils.
- Traditional Use — Antiseptic, anti-inflammatory, respiratory aid.
- Key Phytochemicals — 1,8-cineole, limonene, flavonoids, phenolic acids.
- Growth Habit — Evergreen shrub or small tree, reaching 1-10 meters.
- Ecological Role — Important nectar source for birds and insects in its native habitat.
1.2.Callistemon — Quick Summary
- Callistemon citrinus, or Crimson Bottlebrush, is an Australian native known for its distinctive red flowers.
- Traditionally used by Indigenous Australians for antiseptic and anti-inflammatory purposes.
- Rich in essential oils (like 1,8-cineole and limonene) and phenolic compounds.
- Exhibits potent antiseptic, antimicrobial, and anti-inflammatory properties.
- Primarily recommended for external use; internal use requires extreme caution and expert guidance.
- An attractive ornamental plant with significant ethnomedicinal history and emerging scientific interest.
2.Callistemon — Scientific Identity
3.Callistemon — Categories & Tags
4.Callistemon — Appearance & Identification
5.Callistemon — Water Requirements
- Soil Requirements — Prefers well-drained soil, adaptable to various soil types including sandy, loamy, or clayey, but dislikes waterlogging.
- Sunlight Exposure — Thrives in full sun to partial shade; full sun promotes more abundant flowering and denser growth.
- Watering Regimen — Requires regular watering during establishment, then becomes highly drought-tolerant once mature.
- Pruning Techniques — Prune after flowering to maintain shape, promote bushiness, and encourage more blooms; remove spent flower spikes.
- Propagation Methods — Easily propagated from seeds (which require no special treatment) or semi-hardwood cuttings taken in summer or autumn.
- Fertilization Needs — Benefits from a low-phosphorus, slow-release native plant fertilizer in spring, as high phosphorus can be detrimental.
- Pest and Disease Resistance — Generally robust and resistant to most pests and diseases, though occasionally susceptible to scale insects or sooty mold.
- Hardiness Zones — Best suited for USDA hardiness zones 8-11, tolerating light frosts but preferring warmer climates.
Reviewed by the Flora Medical Global Botanical Review Panel
Multi-disciplinary editorial group · Botany · Ethnobotany · Herbal-medicine literature
Who reviewed this: This page was checked by the Flora Medical Global Botanical Review Panel — an in-house editorial group of botany graduates, ethnobotany researchers, and horticulture practitioners who collectively maintain our 7,000+ plant encyclopedia. Meet the team.
Our 4-step verification process
1. Taxonomic verification
Scientific names and synonyms cross-checked against Kew POWO, World Flora Online, and The Plant List.
2. Phytochemical & medicinal cross-reference
Active compounds, traditional uses, and reported activities are cross-referenced with PubMed, USDA Dr. Duke's database, and peer-reviewed ethnobotanical literature.
3. Conservation & distribution check
Distribution, ecology, and conservation status confirmed against GBIF occurrence records and the IUCN Red List.
4. Editorial & safety review
Every entry passes an editorial pass for clarity, originality, and safety notices (toxicity, contraindications, dosage caveats) before publication.
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Editorial Note: This page is for educational and plant care purposes only.
Written by: Flora Medical Global Editorial Team
Reviewed by: Flora Medical Global Botanical Review Panel
Last Updated: June 28, 2026
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