Crimson bottlebrush
Also known as
Lemon bottlebrush, Red bottlebrush, Callistemon (syn.)
Keep this plant’s care guide close at hand.
Get the appAbout Crimson bottlebrush
Melaleuca citrina, widely known under its synonym Callistemon citrinus, is an evergreen shrub or small tree prized for its vivid, brush-like flower spikes packed with brilliant red stamens. Native to eastern Australia, it typically grows 2–4 m tall (up to 6–13 ft), with narrow, lanceolate, aromatic leaves that release a lemony scent when crushed. New growth may flush bronze to coppery before maturing to deep green. Flowering occurs mainly in spring to early summer, with sporadic blooms later in warm climates, providing abundant nectar for pollinators and, in the Americas, hummingbirds. The plant forms a dense, naturally rounded habit but responds very well to pruning, making it suitable for hedges, screens, and container culture. It tolerates coastal conditions, brief inundation, and once established is reasonably drought-hardy, though best performance comes with regular moisture and full sun. Bark is grey to brown and somewhat fibrous on older stems. Numerous cultivars exist with variations in size, flower intensity, and cold tolerance.
Taxonomy
Properties & Requirements
How to care for Crimson bottlebrush
Water
Keep evenly moist while establishing, watering deeply to wet the root zone, then allow the top 3–5 cm of soil to dry before watering again. Once established in the ground, it tolerates short dry spells but flowers best with regular moisture. Avoid chronic waterlogging; raised beds or amended soil help in heavy clay. In containers, water when the potting mix is dry to knuckle depth, ensuring thorough drainage. Reduce frequency in cool seasons and after flowering flushes.
Light
Provide full sun for profuse flowering—aim for at least 6 hours of direct light daily. Outdoors, choose an open, unshaded site; coastal exposure is fine if soil drains well. Indoors or on patios, place near a south or west window or use high‑output grow lights 12–14 hours daily. Light shade is tolerated but can reduce bloom density and promote leggier growth. Ensure good air movement and rotate container plants for even light exposure.
Nutrients
Feed lightly in spring with a slow‑release, low‑phosphorus fertilizer formulated for Australian natives. Excess phosphorus can damage myrtaceous roots, especially in containers. Supplement with composted organic mulch to conserve moisture and steadily feed soil biology. In alkaline soils, occasional chelated iron helps prevent chlorosis. Avoid high‑nitrogen quick‑release products that spur weak, lanky growth. Container plants benefit from a half‑strength, low‑P liquid feed monthly during active growth; stop feeding 6–8 weeks before expected frost.
Temperature
Best growth occurs between 16–29°C (60–85°F). Mature plants tolerate brief dips to about −6 to −4°C (20–25°F), but flower buds and young growth are frost‑sensitive. In climates colder than USDA Zone 8, grow in containers and overwinter indoors in a bright, cool room (5–10°C/41–50°F) with reduced watering. Protect from harsh, drying winds and sudden cold snaps. Heat tolerant if soil moisture is adequate; mulch to buffer roots during hot spells.
