Callistemon viminalis ‘Rose Opal’ – Rose Opal Bottlebrush

Callistemon ‘Rose Opal’ is a beautiful, compact Australian native shrub prized for its vibrant rose-red bottlebrush flowers and attractive evergreen foliage. This hardy, low-maintenance variety produces masses of colourful blooms that bring life and colour to the garden while attracting nectar-feeding birds, bees and other beneficial pollinators.

With its naturally dense, bushy growth habit and gently arching branches, Rose Opal is an excellent choice for informal hedging, low screening, garden borders and feature planting. Its compact size makes it particularly suitable for smaller gardens, while its colourful flowers provide a striking display against the deep green foliage.

Well suited to Sunshine Coast and South East Queensland gardens, Callistemon Rose Opal tolerates heat, periods of dry weather and a range of soil conditions once established. Its combination of colourful flowering, wildlife appeal and easy maintenance makes it a versatile addition to Australian native and contemporary landscapes.

Flowers

Produces masses of attractive rose-red to deep pink bottlebrush flowers, typically measuring approximately 7–8 cm long. The colourful flower spikes appear predominantly during spring, with additional flowering often occurring in autumn and sporadically throughout the warmer months.

The flowers are rich in nectar and attract honeyeaters, lorikeets, bees and other beneficial pollinators.

Foliage

Evergreen foliage consisting of narrow, deep green leaves arranged along slender, slightly arching branches. Fresh growth may emerge in lighter green tones before maturing to a deeper green.

The dense foliage provides year-round colour and makes Rose Opal particularly effective for low hedging and informal screening.

Fruit

Small, woody seed capsules develop along the stems following flowering. These capsules may remain attached to the branches for extended periods and are generally inconspicuous among the foliage.

Form & Size

Height: Approximately 1.5–2 metres

Width: Approximately 1–1.5 metres

Growth Habit: Compact, dense, bushy evergreen shrub with slightly arching branches.

Growth Rate: Moderate to fast under favourable growing conditions.

Plant Spacing: Approximately 0.8–1.2 metres apart for a dense hedge, allowing for the desired finished appearance.

Regular light pruning can maintain a smaller, more compact shape.

Growing Conditions

Position: Full sun to part shade. Best flowering occurs in a sunny position.

Soil: Adaptable to sandy, loamy and some clay soils. Prefers well-drained soil but can tolerate occasional periods of wetter conditions.

Watering: Water regularly during establishment. Once established, Rose Opal is relatively drought tolerant, although occasional deep watering during prolonged dry periods will encourage healthy growth.

Climate: Well suited to subtropical, warm temperate and temperate climates, including Sunshine Coast and Brisbane gardens.

Frost Tolerance: Tolerates light frost once established. Protect young plants from severe frost.

Coastal Tolerance: Suitable for many coastal gardens, particularly sheltered positions away from severe, direct salt spray.

Uses

• Hedging: Ideal for creating colourful, dense, low-maintenance native hedges.

• Low Screening: Provides attractive evergreen screening for garden boundaries and outdoor living areas.

• Feature Planting: An excellent specimen shrub with vibrant rose-red flowers.

• Australian Native Gardens: Combines beautifully with other native flowering shrubs, grasses and groundcovers.

• Wildlife Gardens: Attracts nectar-feeding birds, bees and beneficial pollinators.

• Garden Borders: Adds colour, structure and year-round foliage to mixed garden beds.

• Mass Planting: Creates an impressive display when planted in groups.

• Large Decorative Pots: Suitable for spacious containers in sunny courtyards, patios and outdoor entertaining areas.

Maintenance

Callistemon Rose Opal is a hardy, relatively low-maintenance shrub once established.

Water regularly during the establishment period, particularly throughout hot or dry weather. Apply a suitable slow-release fertiliser formulated for Australian native plants during spring to encourage healthy growth and flowering.

Mulch around the base with organic mulch to retain moisture and suppress weeds, keeping mulch clear of the main stems.

Lightly prune after the main flowering period to encourage dense, bushy growth and maintain a compact shape. Removing spent flower spikes can also help keep the plant looking tidy and promote fresh growth.

Monitor occasionally for common bottlebrush pests, including sawfly larvae and scale insects.

Notes

Callistemon Rose Opal is a compact selection of the Australian native Weeping Bottlebrush, Callistemon viminalis, offering the attractive flowering characteristics of the species in a smaller, more manageable shrub.

Its distinctive rose-red flowers provide a softer alternative to the bright crimson blooms commonly associated with traditional bottlebrush varieties.

Rose Opal is particularly useful for homeowners looking to establish colourful native hedges, low screens or wildlife-friendly gardens without the maintenance requirements of larger bottlebrush varieties.

Its adaptability to Sunshine Coast and Brisbane growing conditions makes it an excellent choice for residential landscaping projects throughout South East Queensland.

Companion Plants

Westringia fruticosa: Hardy coastal shrub with fine grey-green foliage that contrasts beautifully with Rose Opal's colourful flowers.

Lomandra Little Con: Compact, fine-leafed native grass that provides contrasting texture and structure.

Dianella Little Rev: Attractive blue-grey strappy foliage that complements the deep green leaves and rose-red flowers.

Grevillea Peaches & Cream: Adds contrasting cream, yellow and pink flowers while attracting nectar-feeding birds.

Banksia Birthday Candles: Compact native shrub with striking golden flower spikes, ideal for wildlife-friendly gardens.

Correa alba: Hardy native shrub with soft grey-green foliage and delicate white flowers, suitable for coastal and low-maintenance gardens.