Callistemon citrinus 'Harkness' – Harkness Bottlebrush

• Screening or Privacy
• Shrubs
• Rural Property Planting
• Revegetation or Regeneration
• Council or Civic Landscapes
• Plant in Pots (or) Suitable for Pots

Callistemon citrinus 'Harkness' – Harkness Bottlebrush works in an:

• Australian Native Garden – celebrates local plants with natural character.
• Wildlife Garden – planting to attract birds, bees, and pollinators.
• Coastal Garden – relaxed, seaside feel with hardy, textural plants.
• Modern Garden – sleek, minimal, and design-led planting.
• Low-maintenance Garden – resilient choices for easy care and year-round appeal.

Callistemon citrinus 'Harkness' – Harkness Bottlebrush is an Evergreen (foliage year round) Tree

Mature Height: 2m - 4m Approximately

Mature Width: 1.5m – 2m

Callistemon citrinus 'Harkness' – Harkness Bottlebrush is expected to grow Approx. 40 – 60 cm per year.

Callistemon citrinus 'Harkness' – Harkness Bottlebrush is expected to grow Approx. 40 – 60 cm per year.

They are considered to have a:

• Fast Growth Rate

Is Callistemon citrinus 'Harkness' – Harkness Bottlebrush frost tolerant?

Callistemon citrinus 'Harkness' – Harkness Bottlebrush is Frost Hardy – Survives heavy and frequent frost without damage.

• Tropical QLD (Cairns, Townsville)
• Subtropical QLD (Brisbane, Gold Coast, Sunshine Coast)
• Northern NSW (Byron, Coffs, Armidale)
• Sydney & Central Coast
• South Coast NSW (Illawarra to Bega)
• Inland NSW / Tablelands (Orange, Bathurst, Canberra)
• Melbourne & Surrounds (Metro, Bayside, Geelong, Bellarine, Mornington)
• Western District & Central VIC (Ballarat, Bendigo, Hamilton)
• Gippsland (Latrobe Valley, East Gippsland)
• Adelaide Metro & Coastal
• Adelaide Hills & Barossa

Callistemon citrinus ‘Harkness’ produces brilliant red bottlebrush flowers from late spring through summer, often with a lighter flush in autumn. These vivid, cylindrical blooms sit prominently at the ends of the branches, creating a bold and highly ornamental seasonal display.

Does Callistemon citrinus 'Harkness' – Harkness Bottlebrush flower?

• Yes - Flowers

Flowering Period:

• Summer
• Spring
• Sporadic

Flower Type:

• Fluffy

Flower Colour:

Red

Yes

Callistemon citrinus 'Harkness' – Harkness Bottlebrush is Native to Eastern Australia, particularly New South Wales and Victoria, where Callistemon citrinus naturally grows along streams, wetlands, and open forests.

Its nectar-rich flowers attract honeyeaters, native bees, butterflies and beneficial insects, while the dense, evergreen foliage provides excellent shelter for small birds. The long flowering period offers sustained support for pollinators throughout the warmer months.

Callistemon citrinus 'Harkness' – Harkness Bottlebrush will thrive best in:

• Full Sun

Callistemon citrinus ‘Harkness’ performs best in well-drained sandy or loam soils and prefers slightly acidic to neutral conditions. It tolerates nutrient-poor soils but may struggle in heavy clay or waterlogged positions unless improved with organic matter and coarse material to increase drainage. Keep soil evenly moist during establishment, then reduce watering as it matures and develops excellent drought resilience.

Is Callistemon citrinus 'Harkness' – Harkness Bottlebrush Drought tolerant?

As a young tree it benefits from regular watering, but once established Callistemon ‘Harkness’ develops excellent drought tolerance. It performs reliably in hot, dry and coastal environments, maintaining strong flowering and dense foliage with minimal supplementary watering.