Callistemon Viminalis 'Slim' - Evergreen Trees Direct

Callistemon viminalis 'Slim'

$160.00

Tax included. Shipping calculated at checkout.

Size: 30cm/33cm

30cm/33cm 40cm/45L 75L 100L

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: 2.5m to 3m

Mature Width: 1m to 1.5m

Callistemon viminalis 'Slim' is expected to grow 20cm to 40cm per year.

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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Phone: (03) 7042 3318

About Your New Callistemon viminalis 'Slim'

Callistemon viminalis 'Slim' holds a naturally narrow upright habit just 1 to 1.5 metres wide, which makes it one of the few flowering natives that will screen a boundary in a bed too shallow for a conventional hedge. Vivid red bottlebrush flowers cover it in spring and again in autumn.

'Slim' grows to 2.5 to 3 metres tall at 20 to 40 centimetres per year, filling in densely from ground level without needing to be clipped into shape. It works as a narrow privacy screen, a driveway border, a civic mass planting, or an understorey layer beneath taller canopy trees.

This Australian native grows in full sun, tolerates light to moderate frost once established, and copes with poor soils and extended dry. The flowers are a strong nectar source for honeyeaters and native bees, and maintenance is limited to a light trim after flowering.

Frequently Asked Questions

About Callistemon viminalis 'Slim'

How tall and wide does Callistemon 'Slim' grow?

'Slim' grows to 2.5 to 3 metres tall and only 1 to 1.5 metres wide. That narrow footprint is its defining feature and the reason it is chosen for tight spaces.

How far apart should I plant 'Slim' for a screen?

Plant 80 centimetres to 1 metre apart for a continuous dense screen. Because the plant is naturally narrow, closer spacing works without the crowding that affects wider bottlebrushes.

When does 'Slim' flower?

'Slim' flowers in spring and again in autumn, carrying vivid red bottlebrush flowers. The two distinct flushes give a longer display than single-season flowering natives.

Does 'Slim' need pruning to stay narrow?

No. 'Slim' holds its narrow upright form naturally. A light trim after flowering keeps it dense and tidy, but it does not need clipping to maintain its shape.

Does Callistemon 'Slim' attract birds?

Yes. The nectar-rich red flowers are worked heavily by honeyeaters and native bees through both flowering flushes.

Is 'Slim' suitable for pots?

Yes. Its compact narrow habit suits large pots on balconies, courtyards and terraces where a tall narrow evergreen is wanted. Use a quality potting mix and water regularly through summer.

Is Callistemon 'Slim' frost tolerant?

It handles light to moderate frost once established. Protect young plants through their first winter in colder inland districts.

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.

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Enriched Planting Mix (AO Certified)

$21.95

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Uses in my Garden

Screening or Privacy
Feature Tree
Driveway Border
Council or Civic Landscapes
Underplanting

Callistemon viminalis 'Slim' works in an:

Australian Native Garden – celebrates local plants with natural character.
Formal Garden – structured, symmetrical design with clipped shapes.
Modern Garden – sleek, minimal, and design-led planting.
Wildlife Garden – planting to attract birds, bees, and pollinators.
Low-maintenance Garden – resilient choices for easy care and year-round appeal.

Is Callistemon viminalis 'Slim' Evergreen or Deciduous?

Callistemon viminalis 'Slim' is an Evergreen (foliage year round) Tree

Mature Height & Width

Mature Height: 2.5m to 3m

Mature Width: 1m to 1.5m

Callistemon viminalis 'Slim' is expected to grow 20cm to 40cm per year.

Growth Rate of Callistemon viminalis 'Slim'

Callistemon viminalis 'Slim' is expected to grow 20cm to 40cm per year.

They are considered to have a:

Medium Growth Rate
Fast Growth Rate

Frost Tolerance & Ideal Climate to plant Callistemon viminalis 'Slim'

Is Callistemon viminalis 'Slim' frost tolerant?

Callistemon viminalis 'Slim' is Frost Tolerant – Can handle light to moderate frost once established.

Does Callistemon viminalis 'Slim' Flower?

Callistemon viminalis ‘Slim’ produces bright red bottlebrush flowers from spring through summer, with a lighter repeat flush in autumn. The vivid blooms sit neatly along its narrow, upright branches, giving a bold seasonal display without adding bulk to its slender habit.

Does Callistemon viminalis 'Slim' flower?

Yes - Flowers

Flowering Period:

Spring
Autumn

Flower Type:

Pollinator-attracting

Flower Colour:

Red

Is Callistemon viminalis 'Slim' an Australian Native Tree?

Yes

Callistemon viminalis 'Slim' is Native to Derived from Callistemon viminalis, which is native to eastern Australia, particularly along watercourses and moist soils in Queensland and New South Wales.

What is the Wildlife Value of Callistemon viminalis 'Slim' ?

Its nectar-rich flowers attract honeyeaters, native bees, butterflies and other beneficial insects, while the dense, upright foliage provides shelter for small birds. Its long flowering period offers ongoing support for pollinators across much of the year.

How much Sunlight does Callistemon viminalis 'Slim' need?

Callistemon viminalis 'Slim' will thrive best in:

Full Sun

Preferred Soil?

Callistemon viminalis ‘Slim’ 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 sites unless improved with organic matter and coarse material to boost drainage. Keep soil evenly moist during establishment, then transition to deep, occasional watering as it matures and develops excellent drought resilience.

Is Callistemon viminalis 'Slim' Drought Tolerant?

Is Callistemon viminalis 'Slim' Drought tolerant?

As a young tree it requires regular watering, but once established Callistemon ‘Slim’ develops excellent drought tolerance. It thrives in hot, dry and coastal environments and maintains strong flowering and a tidy, columnar form with minimal supplementary watering.

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How To Plant Your Callistemon viminalis 'Slim'

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 viminalis 'Slim'

Feature tree: 3 to 4 metres apart to allow the full canopy and form to develop.

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

Callistemon viminalis 'Slim' is expected to grow 20cm to 40cm per year.

Medium Growth Rate
Fast Growth Rate

Long Term Care For Your Callistemon viminalis 'Slim'

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: Minimal pruning required. Light tip prune in late winter to maintain shape if used as hedging or screening. For a clear trunk feature, remove lower branches as the tree grows.

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 viminalis 'Slim' in Different Soil

Callistemon Viminalis 'Slim' 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.