Does it need pruning?

Yes, pruning after flowering helps maintain a dense shape and encourages more blooms next year.

Can it grow in a pot?

It grows very well in containers as long as the pot is large and has excellent drainage.

Plant guide

Bottlebrush.

Callistemon citrinus

Pronounced kal-lis-STEE-mon si-TRY-nus

Also known as Crimson bottlebrush, bottle brush

crimson bottlebrush — Photo by Max Campbell (CC BY) via iNaturalist

The bottlebrush is a stunning shrub known for its unique, vibrant flower spikes that resemble a cleaning brush. It loves plenty of sunshine and brings a wonderful tropical feel to any garden. You will find it is quite hardy once it gets settled in its spot.

Another photo of Bottlebrush — Photo by zebedeugalinha (CC BY) via iNaturalist

At a glance

Care level: Easy
Plant type: Evergreen shrub
Light: Full sun
Indoor light: Direct sun
Water: Every 7 to 14 days
Mature size: 10 to 15 feet
Growth rate: Medium
Hardiness: USDA 8 to 11
Bloom time: Late spring to summer

Care

Plant this beauty in a spot that gets plenty of sun to encourage the best blooms. Keep an eye out for yellowing leaves, which often signal that the soil is too alkaline or lacks proper drainage. Regular pruning after the flowering season helps keep the shrub dense and full.

Watering: Water deeply once the top few inches of soil feel dry to the touch.
Feeding: Apply a balanced, slow release fertilizer in early spring to support growth.
Pruning: Trim back the branches right after the main flowering period ends.
Repotting: Move to a larger container only when the roots have filled the current pot.
Soil: Well draining, slightly acidic soil
Soil pH: 5.5 to 6.5
Temperature: -7 to 40°C
Humidity: 40 to 70%
Drought tolerance: Moderate
Lifespan: Perennial, typically 15 to 25 years
Fragrance: Light
Deer and rabbits: High

Signs it needs repotting

Roots growing out of the drainage holes.
Water sitting on the surface for too long.
Stunted growth during the active season.

Safety

People: This plant is generally considered non-toxic, but the foliage can be irritating to sensitive skin.
Pets: This plant is generally considered non-toxic to cats and dogs.
Children: The stiff, brush-like flowers and woody seed capsules could pose a minor choking hazard if placed in the mouth.
Contact allergens: Handling the foliage or flowers may cause mild skin irritation in some individuals.
Airborne allergens: The pollen can trigger mild allergic reactions in sensitive people during the flowering season.
Edibility: The plant is not considered edible and ingestion may cause gastrointestinal distress.

How to identify it

Bright red cylindrical flower spikes
Narrow, lance shaped evergreen leaves
Leaves smell like lemon when crushed
Woody stems with rough bark

Height: 1.8 to 3m
Spread: 1.5 to 2.5m
Leaves: green, evergreen
Flowers: red, 5 to 10cm
Fruit: brown, Autumn

Problems to watch for

Scale InsectsCommon
Myrtle RustUncommon
Root RotUncommon
Sooty MoldUncommon

By symptom

Plant problems by symptom

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Growing it

Propagation: cuttings, seed
When to plant: Spring, Autumn
Overwintering: In colder regions, move container plants to a sheltered spot or frost-free area. Protect young plants from heavy frost with horticultural fleece.
In containers: It thrives in containers, provided you use a pot at least 40 centimeters wide with high-quality potting mix.

Semi-hardwood cuttings

1. Take 10 centimeter cuttings in late summer.
2. Remove lower leaves.
3. Dip in rooting hormone.
4. Place in a moist, sandy medium.
5. Keep in a humid spot until rooted.

Pair this shrub with other Australian natives that appreciate full sun and well-draining soil for a low-maintenance garden.

Grows well with

Grevillea · They share similar environmental needs and attract a wide range of pollinators.
Westringia · This coastal rosemary provides a nice textural contrast to the bottle brush foliage.

Similar species

Weeping Bottlebrush · It has a similar flower structure but features a distinct weeping growth habit.

Science

Family: Myrtaceae
Genus: Callistemon
Order: Myrtales
Class: Magnoliopsida
Native range: Eastern Australia
Conservation: This species is common in cultivation and not currently of conservation concern.

It naturally thrives in moist areas along creek beds and swamps where it can access consistent water.

Value to wildlife: nectar source
Pollinators: bees, butterflies, hummingbirds
Uses: ornamental shrub, privacy screen, pollinator garden

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 3/9
Soil reaction: 5/9
Light: 8/9
Temperature: 7/9
Moisture: 6/9
Nutrients: 4/9

Taxonomy resolved against GBIF.

Questions people ask

Does it need pruning?: Yes, pruning after flowering helps maintain a dense shape and encourages more blooms next year.
Can it grow in a pot?: It grows very well in containers as long as the pot is large and has excellent drainage.

Where the name comes from

The name Callistemon comes from the Greek words for beautiful and stamen, while citrinus refers to the citrus scent of the leaves.

Good to know

The leaves release a citrus scent when crushed.
It is highly adaptable to various soil types including clay.
The flowers are actually clusters of stamens.

Also in

Deer-resistant plants

Keep your bottlebrush growing

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This guide was generated with AI on September 26, 2026 and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.