Callistemon sieberi - Evergreen Trees Direct

Callistemon sieberi

$250.00

Tax included. Shipping calculated at checkout.

Size: 40cm/45L

40cm/45L

Current Stock Height Guides

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

Height guide disclaimer: Height ranges are approximate only. As living products, plant heights naturally vary between individual plants, batches, and seasons. No guarantee is given that supplied plants will fall within the stated range. If minimum heights are required, you mustconfirm current batch heights with Evergreen Trees Direct prior to purchase. Variation in height is normal and is not grounds for return, refund, replacement, or compensation.

Mature Height & Width

Mature Height: 2m to 3m (approx.)

Mature Width: 3m to 5m

Callistemon sieberi is expected to grow 30cm to 60cm per year (approx.).

Root Ball Dimensions

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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Email: sales@evergreentrees.com.au

Phone: (03) 7042 3318

About Your New Callistemon sieberi

Callistemon sieberi handles what most shrubs cannot. The River Bottlebrush grows naturally in stream beds that flood and then dry out completely, so it tolerates both extended inundation and hard drought, which makes it invaluable along drainage lines and in problem corners.

Callistemon sieberi grows to 2 to 3 metres tall and spreads 3 to 5 metres wide at 30 to 60 centimetres per year, forming a broad dense shrub with fine narrow foliage. Soft cream to pale yellow bottlebrush flowers appear through spring and summer, attracting honeyeaters and native bees.

This Australian native is frost hardy, surviving heavy and frequent frost without damage, and tolerates poor and rocky soils. It grows in full sun and is widely used in riparian revegetation, erosion control and low-maintenance civic planting.

Frequently Asked Questions

About Callistemon sieberi

How big does Callistemon sieberi grow?

It grows to 2 to 3 metres tall and spreads 3 to 5 metres wide, forming a broad dense shrub. It is wider than it is tall, unlike most upright bottlebrushes.

Does Callistemon sieberi tolerate flooding?

Yes. It grows naturally in stream beds that flood periodically and then dry out, so it handles both inundation and drought better than almost any other shrub.

What colour are the flowers?

Flowers are soft cream to pale yellow, sometimes with a pink tinge, and are more delicate in tone than the vivid reds of most bottlebrushes.

Is Callistemon sieberi frost hardy?

Yes. It is frost hardy and survives heavy and frequent frost without damage, which suits it to cold inland and tablelands districts.

Where is it best used?

Along drainage lines, creek banks, dam edges and low-lying corners where water sits after rain, and in erosion control and riparian revegetation planting.

Does it attract wildlife?

Yes. The nectar-rich flowers are worked by honeyeaters and native bees, and the dense low branching provides shelter for small birds.

How far apart should I plant it?

Plant 2 to 3 metres apart for a continuous mass or bank stabilisation planting, allowing for its broad spreading habit.

Enriched Planting Mix (AO Certified)

$21.95

Enriched Planting Mix is a certified organic blend of Pure Magic Compost, composted animal manure, gypsum, composted coarse bark and a wetting agent, bagged in 30L. It is built to be dug through existing garden soil at planting time rather than used on its own, and the gypsum is what sets it apart from a plain compost.

Gypsum helps break up heavy clay so water and roots can move through it, while the compost and manure return organic matter and nutrient to tired ground. The coarse bark holds structure and keeps air around the root zone, and the wetting agent keeps moisture in the soil longer after rain or watering.

Use it when planting trees, shrubs, roses, fruit trees and exotic garden plants, particularly into clay. Dig a hole twice the width of the pot and 7 centimetres deeper, then mix roughly one third planting mix through the excavated soil. Spread 7 centimetres of that improved soil in the base before setting the plant in.

Frequently Asked Questions

About Enriched Planting Mix

What is Enriched Planting Mix made from?

It is a blend of Pure Magic Compost, composted animal manure, gypsum, composted coarse bark and a wetting agent. Each part has a job. The compost and manure supply organic matter and nutrient, the gypsum works on clay structure, the bark keeps air around the roots and the wetting agent holds moisture in the soil.

What plants is it suitable for?

It suits exotic garden plants, including roses, ornamental and deciduous trees, fruit trees, shrubs and perennials, and it earns its keep most on heavy clay sites. It is a planting mix rather than a potting mix, so its job is improving soil at planting time. Phosphorus sensitive natives are the one clear exception.

Is it safe for natives?

No, not for the phosphorus sensitive ones. The composted animal manure in this blend lifts phosphorus well above what Proteaceae such as Banksia, Grevillea, Hakea and Protea will tolerate, and the result can be leaf burn, dieback and plant death. Use the Native Potting Mix for those species, or plant them into unimproved local soil.

Is it certified organic?

Yes. It is a certified organic product with no chemical additives, which is why the manure and compost in it are fully composted rather than raw. That makes it sound around fruit trees and vegetable beds, and it means you are adding genuine organic matter to your soil rather than a synthetic conditioner.

How much do I need?

Work on roughly one third planting mix to two thirds of the soil you dug out of the hole. For a shrub out of a 200 millimetre pot that is only a few litres. An advanced tree going into a large hole will take considerably more. Judge the quantity by the volume of the hole rather than the size of the plant.

Can I use it in pots?

It is not a potting mix and should not be used on its own in a container. The blend is designed to be diluted through garden soil, and used straight in a pot it holds too much water and settles badly. For containers, reach for a premium potting mix, or the native mix if you are potting natives.

Does it need to be watered in?

Yes. Water the plant well several hours before you plant it, then water thoroughly again once the hole is backfilled and the soil firmed down. That first deep watering settles the improved soil around the root ball and drives out air pockets. Keep the water up over the first few months while the roots establish.

View full details

Type: Garden Supplies

Enriched Planting Mix (AO Certified)

$21.95

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Uses in my Garden

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.

Is Callistemon sieberi Evergreen or Deciduous?

Callistemon sieberi is an Evergreen (foliage year round) Tree

Mature Height & Width

Mature Height: 2m to 3m (approx.)

Mature Width: 3m to 5m

Callistemon sieberi is expected to grow 30cm to 60cm per year (approx.).

Growth Rate of Callistemon sieberi

Callistemon sieberi is expected to grow 30cm to 60cm per year (approx.).

They are considered to have a:

Medium Growth Rate
Fast Growth Rate

Frost Tolerance & Ideal Climate to plant Callistemon sieberi

Is Callistemon sieberi frost tolerant?

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

Does Callistemon sieberi Flower?

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.

Does Callistemon sieberi flower?

Yes - Flowers

Flowering Period:

Summer
Spring

Flower Type:

Fluffy

Flower Colour:

Yellow

Is Callistemon sieberi an Australian Native Tree?

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.

What is the Wildlife Value of Callistemon sieberi ?

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.

How much Sunlight does Callistemon sieberi need?

Callistemon sieberi will thrive best in:

Full Sun

Preferred 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.

Is Callistemon sieberi Drought Tolerant?

Is Callistemon sieberi Drought tolerant?

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.

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How To Plant Your Callistemon sieberi

Site: Choose a well-drained position in full sun to part shade with room for the canopy to develop.

Soil preparation: Enrich the planting area with quality compost and aged manure for a strong establishment phase.

Hole: Dig twice as wide as the root ball and the same depth.

Planting: Position level with the surrounding soil, backfill gently, firm in, then water deeply to settle the roots.

Recommended Planting Spacing For Your Callistemon sieberi

Hedging and screening: 1 to 1.5 metres apart for a dense informal screen, or 80 centimetres apart for a tighter formal hedge.

Avenue planting: 3 metres apart for a uniform soft-textured avenue.

Callistemon sieberi is expected to grow 30cm to 60cm per year (approx.).

Medium Growth Rate
Fast Growth Rate

Long Term Care For Your Callistemon sieberi

Watering: Water deeply twice weekly through the first 12 months. Once established, this is drought tolerant and only needs a deep soak during extended dry periods.

Mulching: Apply a 5 to 7 centimetre layer of organic mulch over the root zone, keeping it 5 centimetres clear of the trunk.

Pruning: Tip prune in late winter and again in summer to build dense growth. For a formal hedge, light shaping two to three times a year keeps lines crisp.

Fertilising: Apply a slow-release native blend in early spring and again in autumn. Avoid high-phosphorus formulations as a precaution.

Pest and disease: Hardy against most pests and diseases. Occasional inspection in warm humid conditions is all that's needed.

Planting Your Callistemon sieberi in Different Soil

Callistemon sieberi performs best in well-drained sandy loam or loam with a slightly acidic to neutral pH. Adaptable to a wide range of soils when drainage is improved with organic matter.

Sandy soil: Free-draining and ideal. Mulch well to maintain consistent moisture.

Clay soil: Improve drainage with gypsum and organic compost before planting.

Loam: The preferred soil for steady root development and consistent growth.

pH: Slightly acidic to neutral preferred. Mulch with composted leaf litter to maintain levels naturally.

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.