Crimson bottlebrush
Callistemon citrinus · Myrtaceae
📷 JJ Harrison (https://www.jjharrison.com.au/) · CC BY-SA 3.0
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around crimson bottlebrush and prepare for winter.
ID card
- Common name
- Callistemon, Bottlebrush tree
- Family
- Myrtaceae
- Foliage
- Evergreen, lanceolate and aromatic
- Flowering
- May to August, characteristic red bottlebrush flowers
- Adult size
- 1.5 to 2 m in height, spreading and bushy habit
- Growth
- Fast to moderate
- Hardiness
- Cold-sensitive, ideal in Mediterranean climate or in sheltered pot
- Origin
- Australia (coastal region of New South Wales)
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability medium.
Expert tips
The key tip
Mulch generously at planting time and maintain soil without waterlogging: roots hate even slight water saturation. Pruning after flowering removes dead wood and opens up the shrub, essential to prevent internal rot.
The common mistake
Excess water weakens Callistemon more often than drought; many believe you need to water it regularly like a normal shrub.
The pro's trick
Pinch back young shoots regularly (April-May) to get a compact, bushy form rather than a long, bare-stemmed plant.
Care
Sunlight
Callistemon thrives in full sun, an essential condition for abundant and regular flowering. Plant it in a location sheltered from cold and violent winds. A south or south-west facing exposure is ideal to optimize warmth and light.
Watering
Keep the soil moist (not waterlogged) during growth and flowering. Reduce watering in winter, especially if temperatures drop. Prefer regular summer watering rather than heavy soakings. Ensure perfect drainage in the pot or planting hole.
Soil
Callistemon tolerates poor and even sandy soils, provided they are well-drained. Avoid chronic waterlogging. A light mix of potting soil, sand and bark works perfectly for container cultivation. It slightly prefers acidic soil.
Pruning and cutting
Prune after flowering (late August-September) to maintain shape and stimulate branching. Remove dead or diseased branches. Regular light pruning promotes a more compact habit and richer flowering the following year.
Fertilizer
Apply a balanced or phosphorus-poor fertilizer in spring and early summer. Reduce applications in autumn-winter. Avoid excess that would encourage foliage at the expense of flowers. Minimal feeding is sufficient on naturally enriched soils.
Diseases and pests
Callistemon is generally robust. Watch for mealybugs and red spider mites indoors or in the greenhouse. In humid areas, monitor root rot linked to excess water. Good air circulation and measured watering prevent most problems.
Did you know?
Callistemon takes its name from the Greek words 'kallos' (beauty) and 'stemon' (stamen), as its spectacular flower spikes resemble a bottle brush. Native to Australia, it conquered Mediterranean gardens in the 19th century and remains a symbol of exotic flora in warm temperate regions.
Where to buy it
Best planted in autumn so the roots settle in before summer, or in early spring once the frost has passed. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, October, November.
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Tips generated and checked by Viridia — adapt them to your local climate.