Callistemon citrinus 'Harkness' – Harkness Bottlebrush

Size: 40cm/45L
Sale price$250.00

Callistemon citrinus 'Harkness' is a compact, evergreen Australian native shrub with dense growth and vivid red bottlebrush flowers. It’s ideal for hedging, screening, borders, and native gardens, offering year-round structure and reliable flowering.

It typically grows 1.5–2.5 metres tall with a bushy form that responds well to pruning. Crimson-red flowers appear in spring and again in late summer, attracting birds, bees, and beneficial insects. The fine foliage is aromatic when brushed, adding sensory appeal.

They look excellent when planted as a low hedge or grouped in native plantings. Callistemon citrinus 'Harkness' thrives in full sun, tolerates light frost, and is drought-tolerant once established, making it a reliable choice for low-maintenance, bird-friendly, and coastal gardens.

 

Please note, as living products, our trees naturally vary in size and appearance throughout the seasons. The photos on our website are provided as a helpful guide, but may not always reflect our current batches. We always aim to deliver stock as pictured, but some variation is to be expected. For up-to-date sizing, please refer to our current height guide. If you’d like to see photos of our current stock, just let us know—we’re happy to send them!

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About This Tree

Botanical Profile

Explore the essential characteristics and growth habits of this plant, curated to assist you in making an inspired and confident choice for your landscape.

Mature Height & Width

Mature Height:

Mature Width:

1.5m – 2m

Expected Growth Pear Year

Approx. 40 – 60 cm per year

Evergreen/ Deciduous

Evergreen (foliage year round)

Frost Tolerance

Frost Hardy – Survives heavy and frequent frost without damage.

Sunlight Tolerance
  • Full Sun
Form & Shape

Callistemon citrinus 'Harkness' – Harkness Bottlebrush is considered:

  • Shrub
  • Spreading
  • Upright
Australian Native?

Yes

Flowering Information

Flower Colour: Red

Flower Type:

  • Fluffy

Flowering Period

  • Summer
  • Spring
  • Sporadic
Foliage Type / Shape
  • Fine

As Featured In

Here Is What Customers Like You Frequently Ask

FAQ

Frequently Asked Questions

  • Can Callistemon citrinus 'Harkness' thrive in pots? Yes, with proper drainage, it's suited for container planting.
  • What's the best time to prune? Late spring or after its main flowering season.

About

Planting Guide

Plant Spacing

Hedging & Screening: 1 m – 1.5 m – Compact, upright, and great for colourful screening

Feature Tree: 1.5 m – 2.5 m – Room to show flowers and form

Avenue Planting Trees: 3 m – 4 m – Narrow form suitable for tighter rows

How to Plant Callistemon citrinus 'Harkness' – Harkness Bottlebrush

How to Plant Callistemon citrinus 'Harkness'

  1. Select a Site: Choose a location with good sunlight and well-draining soil.
  2. Prepare the Soil: Enrich the ground with compost or organic matter for better results.
  3. Dig a Hole: Ensure it's around twice the size of the root ball.
  4. Planting: Position the Callistemon in the hole, backfill with soil, and water generously.

Root Ball Dimensions (Width × Depth) For Planting

Use this as a reference when digging your planting hole. We recommend digging at least 10% wider than the dimensions below to encourage strong root development.

  • 30cm Pot: 33cm (W) × 30cm (D)
  • 40cm/45L Pot: 44cm (W) × 41.5cm (D)
  • 50cm Pot / 70L Pot: 55cm (W) × 41.8cm (D)
  • 100L Bag: 50.6cm (W) × 52.8cm (D)
  • 150L Bag: 66cm (W) × 55cm (D)
  • 200L Bag: 71.5cm (W) × 60.5cm (D)
  • 300L Bag: 88cm (W) × 63.8cm (D)
  • 400L Bag: 99cm (W) × 66cm (D)
  • 500L Bag: 122cm (W) × 66cm (D)
  • 750L Bag: 134cm (W) × 69cm (D)
  • 1000L Bag: 146.3cm (W) × 71.5cm (D)
  • 2000L Bag: 176cm (W) × 82.5cm (D)

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Evergreen Trees Direct is Australia's unrivaled supplier of the highest quality advanced tree stock. Our extensive supplier network allows us to provide a one-stop shop for all your landscaping needs, no matter how big or small the project. We pride ourselves on exceptional service, ensuring a seamless experience from selection to delivery. Trust us to bring your landscaping vision to life with the perfect trees for any outdoor space. With our unrivaled selection and commitment to service, Evergreen Trees Direct is the top choice for landscapers, property developers, and garden enthusiasts alike.

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