Callistemon sieberi - Evergreen Trees Direct

Callistemon sieberi

Name: Callistemon sieberi
Brand: Evergreen Trees Direct
SKU: CALSIE40cm/45L
Price: 250.00 AUD
Availability: InStock

$250.00

Tax included. Shipping calculated at checkout.

9998 in stock

Size: 40cm/45L

40cm/45L

Current Stock Height Guides

40cm/45L: Enquire within for height guide information.

Trade Customers

We supply advanced trees to landscapers, developers, architects, and councils Australia-wide. Trade clients receive fast quotes, expert advice, and access to premium stock with reliable freight.

About Callistemon sieberi

Callistemon sieberi, commonly known as the River Bottlebrush, is a resilient Australian native shrub known for its soft-textured, linear foliage and pale yellow to creamy-white bottlebrush flowers. These eye-catching blooms appear in spring and attract birds and pollinators, adding biodiversity to the garden.

They look excellent when planted along waterways, in native gardens, or used as informal screens. Callistemon sieberithrives in full sun to part shade, tolerates frost and occasional waterlogging, and adapts well to both moist and drier conditions with minimal maintenance.

Key Information to Know

Evergreen / Deciduous

Callistemon sieberi is an Evergreen (foliage year round) Tree

Mature Height & Width

Mature Height: 2m - 3m Approximately

Mature Width: 3m – 5m

Callistemon sieberi is expected to grow Approx. 30 – 60 cm per year.

Frost Tolerance

Is Callistemon sieberi frost tolerant?

Callistemon sieberi is Frost Hardy – Survives heavy and frequent frost without damage.

Flowering Information

Callistemon sieberi produces soft cream to pale-yellow bottlebrush flowers from spring through summer. These lightly coloured blooms cluster along the branch tips, creating a gentle seasonal display that contrasts beautifully with its fine, willow-like foliage.

Native Information

Is Callistemon sieberi an Australian Native? Yes

Callistemon sieberi is Native to Eastern Australia, from Queensland through New South Wales, Victoria and Tasmania, where it grows naturally along rivers and streams.

Wildlife Value

Its nectar-rich flowers attract honeyeaters, native bees, butterflies and other beneficial insects, while its dense evergreen foliage provides shelter and nesting sites for small birds. The extended flowering season also supports pollinators when other nectar sources are limited.

Sunlight Information

Callistemon sieberi will thrive best in:

Full Sun

Preffered Soil

Callistemon sieberi performs best in well-drained sandy or loam soils and prefers slightly acidic to neutral conditions. It can tolerate poorer soils but may struggle in heavy clay or waterlogged positions unless improved with organic matter and coarse material to enhance drainage. Keep soil evenly moist during establishment, then gradually reduce watering as the tree matures and develops its excellent drought resilience.

Botanical Information

Common Name: Alpine Bottlebrush / River Bottlebrush

Genus: Callistemon

Botanical Species: sieberi

Family: Myrtaceae

Botanical Name: Callistemon sieberi

Landscape Uses

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

Callistemon sieberi 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.
Woodland Garden – layered, naturalistic design under dappled light.
Low-maintenance Garden – resilient choices for easy care and year-round appeal.

Planting, Spacing & Care

How to Plant Callistemon sieberi

Site Selection: Opt for a spot with well-drained soil, although it tolerates wet conditions.
Soil Preparation: Enrich soil with organic compost for better growth.
Hole Digging: Dig a hole roughly twice the size of the root ball.
Planting: Position the Callistemon in the hole, ensuring it's level, backfill with soil, and water generously.

Hedging & Screening: Plant 1 m apart for a dense hedge.

Feature Tree: Plant 1.5 m – 2.5 m apart to allow for natural shaping.

Avenue Planting Trees: Not typically used.

Caring for Callistemon sieberi

Watering: Water regularly during the first year to establish. Thereafter, water periodically.
Mulching: A layer of organic mulch helps conserve soil moisture.
Pruning: Trim lightly post-flowering to encourage a denser habit.

Optimizing Soil for Vibrant Blooms and Attractive Foliage

Ideal Drainage: Callistemon species do best in well-drained, slightly acidic soils.

Well-Draining Soil: Perfect for promoting vibrant flowering and health.

If you have the following soil, here are some tips for you:

Sandy Soil: Excellent for Callistemon; maintain fertility with controlled-release, low-phosphorus fertilizers.
Clay Soil: Typically challenging for Callistemon; heavily amend with gypsum, sand, and compost for better drainage and root health.
Loamy Soil: Very good if well-drained; avoid over-enrichment which can lead to lush growth at the expense of blooms.
Peaty Soil: High organic content is beneficial; ensure it is well-drained with the addition of perlite or sand to avoid root rot.

Callistemon sieberi is expected to grow Approx. 30 – 60 cm per year.

Medium Growth Rate
Fast Growth Rate

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)

Ideal Conditions

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

Thrives in

Full Sun

Frost Tolerance

Frost Hardy – Survives heavy and frequent frost without damage.

Drought Tolerance

As a young tree it requires regular watering, but once established Callistemon sieberi develops excellent drought tolerance. It performs reliably in dry, inland and coastal environments and maintains its graceful habit with minimal supplementary watering.

Flowering Information

Does Callistemon sieberi flower?

Yes - Flowers

Flowering Period:

Summer
Spring

Flower Type:

Fluffy

Flower Colour:

Yellow

Frequently Asked Questions

Frequently Asked Questions

How do I enhance the flowering of Callistemon sieberi? Regular pruning and a balanced fertilizer can boost flowering.
Is it salt-tolerant? Yes, Callistemon sieberi can tolerate mild salt conditions, making it suitable for coastal plantings.

youtube