Weeping bottlebrush

Sun

Full sun; tolerates light shade but flowers less freely.

Water

Water regularly while establishing. Established trees tolerate some drought, but grow and flower better with deep watering during prolonged dry weather.

Soil

Moisture-retentive, well-drained soil, preferably slightly acidic to neutral. Tolerates brief wet periods; strongly alkaline soil can cause yellow leaves.

Height

20-30 ft (6-9 m), occasionally 40 ft (12 m)

Spread

15-25 ft (4.5-7.5 m)

Flowers

Bright red bottlebrush flowers, mainly in spring and summer, with scattered repeat flowering in warm climates.

Foliage

Evergreen. Narrow, leathery green leaves on long, drooping branchlets; young growth may be bronze or pinkish.

Growth

Moderate to fast in warm conditions with adequate water.

Care needed

Medium

• Pollinators
• Drought tolerant
• Heat tolerant
• Wildlife
• Low allergen

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Hard

Toughness

Fairly tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   7 ft (2 m)

2. After 1 year

   8 ft (2.3 m)

3. After 2 years

   9 ft (2.7 m)

4. After 3 years

   10 ft (3 m)

5. After 5 years

   12 ft (3.7 m)

About 16 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Safe

Growth rate

Fast

• Water deeply through the first two growing seasons, letting the surface soil begin to dry between waterings.
• Spread 2-3 in (5-8 cm) of organic mulch over the root area, keeping it clear of the trunk.
• If growth is weak, apply a light dressing of low-phosphorus fertiliser in spring; avoid heavy feeding.
• Stake young trees only if unstable, using flexible ties and removing the support once roots hold firmly.
• Use a large container with drainage holes in cold regions, and move it into bright, frost-free shelter before freezing weather.

Pruning. Lightly shorten flowered shoots just behind the spent flower heads after the main flush, preserving the naturally weeping outline. Remove dead or crossing branches and gradually raise the canopy if needed; avoid routine hard cutting or topping.

Spring

Plant once frost risk has passed, or return overwintered containers outdoors gradually.

Spring

Refresh mulch and feed lightly if growth is weak.

Late spring

After the main flowering flush, lightly trim spent shoots if shaping is needed.

Summer

Water young trees deeply during dry spells and check containers frequently.

Late summer

Take semi-ripe cuttings from healthy, non-flowering shoots.

Autumn

Move container plants under bright, frost-free cover before the first frost.

Winter

Keep sheltered container plants barely moist, not waterlogged, and check for scale insects.

• Plant as a lawn specimen where its arching canopy can develop without repeated clipping.
• Use as a loose evergreen boundary screen in warm gardens, allowing space for its mature width.
• Combine with lomandra and kangaroo paw in an Australian planting with contrasting leaf shapes.
• Place beside a broad terrace or garden path where the hanging flowers are visible, keeping branches clear of access routes.

Garden styles it suits: Australian native, Mediterranean, Coastal, Wildlife garden, Modern tropical and Luxury resort.

Plant it with: Lomandra, Kangaroo paw, Coastal rosemary, New Zealand flax, Agapanthus and Society garlic.

Wildlife: Nectar-rich flowers attract bees and nectar-feeding birds, including honeyeaters in Australia and hummingbirds where they occur in North America. The evergreen canopy also provides cover for birds.

• Scale insects can cause sticky honeydew and black sooty mould: inspect stems and leaf undersides, and treat small infestations with horticultural oil according to the label.
• Yellow leaves with green veins often indicate iron deficiency in alkaline soil: check soil pH and use an appropriate iron chelate rather than adding general fertiliser.
• Root rot can develop in persistently stagnant soil or poorly drained pots: improve drainage, keep pot drainage holes clear and avoid leaving containers standing in water.
• Frost can scorch leaves and kill young shoots: shelter young plants, overwinter containers frost-free and wait until spring growth begins before removing damaged wood.

Not known to be toxic to cats, dogs, horses or people; no part is recognised as poisonous. It is not a food plant, and eating substantial quantities of foliage may still cause digestive upset.

Where it spreads. Invasive in parts of South Africa, particularly along watercourses, where escaped plants can displace native vegetation. Check local restrictions before planting there.

• Crimson bottlebrush (Callistemon citrinus)

  Usually has a more upright, shrubby habit and leaves that smell distinctly lemony when crushed; weeping bottlebrush has much more pendulous branchlets.

• Willow bottlebrush (Callistemon salignus)

  Usually bears cream or pale yellow flowers rather than red, and develops conspicuous pale, papery bark.

Callistemon comes from Greek words meaning 'beautiful stamen', while viminalis means 'with long, flexible shoots'; the common name describes its drooping branches and bottlebrush-shaped flowers.

Propagation. Sow seed in a warm, bright place, pressing it onto the surface of a fine seed compost. Take semi-ripe cuttings in late summer to preserve the characteristics of a selected plant; seedlings may vary.

Accepted botanical name

Callistemon viminalis

Sources: GBIF (CC BY 4.0). The care and design notes are LandscapeGPT's own.