Published: 03/12/2025 | Last Updated: 22/08/2026 | Reading Time: 21 minutes

Growing Cinnamon Myrtle (Backhousia myrtifolia) – Complete Australian Native Care Guide

Cinnamon Myrtle (Backhousia myrtifolia), also known as Grey Myrtle, stands as one of Australia’s most versatile native plants, offering aromatic foliage, attractive cream flowers, and valuable culinary applications all in one hardy package. Endemic to the subtropical rainforests of eastern Australia from central NSW to southeast Queensland, this remarkable tree has gained popularity among gardeners seeking low-maintenance natives that provide multiple benefits beyond mere ornamental value¹.

What sets Cinnamon Myrtle apart from other Australian natives is its intensely aromatic leaves containing high concentrations of elemicin and methyl eugenol, creating a distinctive cinnamon-spice fragrance when crushed. Unlike imported cinnamon trees that struggle in Australian conditions, Backhousia myrtifolia thrives naturally in our climate while providing a superior local alternative for culinary and aromatic applications. Whether you’re establishing a native hedge, creating an edible landscape, or simply wanting a beautiful screening plant, Cinnamon Myrtle adapts brilliantly to various garden situations from Brisbane’s humidity to Melbourne’s variable conditions.

This comprehensive guide covers everything needed to successfully grow Cinnamon Myrtle, from selecting the right location and soil preparation through to harvesting leaves for culinary use and managing common challenges. We’ll explore its role in supporting native wildlife, companion planting strategies for Australian gardens, and creative ways to incorporate this aromatic treasure into both formal and informal landscape designs.

What Makes Cinnamon Myrtle an Essential Australian Native

Origin and Natural Habitat

Backhousia myrtifolia naturally occurs in the subtropical rainforests and wet sclerophyll forests of eastern Australia, from the Bellinger River in northern NSW to Fraser Island in Queensland. In its native habitat, it grows as an understorey tree in protected gullies and along creek banks, reaching heights of 20 metres in optimal rainforest conditions. The species was first described by botanist Ferdinand von Mueller in 1859 and named after James Backhouse, an English botanist who extensively documented Australian flora. This natural distribution explains why Cinnamon Myrtle performs exceptionally well in coastal and near-coastal gardens from Sydney to Brisbane while adapting successfully to cultivation in Melbourne and Adelaide with appropriate care².

Key Ornamental Features

The most distinctive feature of Cinnamon Myrtle is its highly aromatic foliage – oval leaves measuring 5-12cm long emit an intense cinnamon fragrance when crushed or brushed against. The leaves display an attractive olive-green colour with a slightly grey undertone on the undersides, hence the common name Grey Myrtle. From October through February, the tree produces clusters of small cream to white flowers, each about 7mm across, creating a stunning display that covers the canopy. These are followed by small brown capsules containing seeds. The bark develops an attractive mottled pattern as the tree matures, adding year-round visual interest even when not in flower.

Growth Habit and Mature Size

In cultivation, Cinnamon Myrtle typically reaches 3-7 metres in height with a spread of 2-4 metres, significantly smaller than its rainforest proportions. The growth rate is moderate to fast, adding 30-60cm annually in favourable conditions. Young plants develop a pyramidal shape that broadens with age into a dense, rounded crown. The root system is relatively non-invasive, making it suitable for planting near buildings and paved areas. When grown as a hedge, Cinnamon Myrtle responds excellently to pruning, maintaining a dense form at any height from 1.5 metres upward.

Essential Growing Requirements for Cinnamon Myrtle Success

Light Requirements for Optimal Growth

Cinnamon Myrtle thrives in full sun to partial shade, with best growth and flowering occurring in positions receiving at least 4-6 hours of direct sunlight daily. In its natural rainforest habitat, young plants tolerate considerable shade, making this species adaptable to various garden situations. In Brisbane and northern NSW, the plant benefits from afternoon shade during extreme summer heat. Sydney and Central Coast gardens can provide full sun positions. In Melbourne and Adelaide’s harsher sun, some afternoon protection prevents leaf scorch during heatwaves. The aromatic oil content in leaves increases with sun exposure, so position accordingly if growing for culinary use³.

Temperature and Climate Considerations

This hardy native tolerates temperatures from -5°C to 40°C once established, though young plants need frost protection for the first two winters. Optimal growth occurs between 15-30°C, explaining its excellent performance in coastal NSW and Queensland. In Melbourne, Canberra and highland areas, plant in spring after frost risk passes and provide wind protection. Mature trees handle light frosts better than many subtropical species, with only minor tip damage in temperatures down to -3°C. During extreme heat above 35°C, increased watering prevents stress-related leaf drop.

Complete Soil Preparation and Planting Guide

Ideal Soil Conditions

Cinnamon Myrtle prefers well-draining soil enriched with organic matter, mimicking the humus-rich forest floors of its natural habitat. While adaptable to various soil types, it performs best in slightly acidic to neutral pH (5.5-7.0). For heavy clay soils common in Melbourne and Adelaide, incorporate gypsum to improve drainage and add generous amounts of compost. Sandy Perth soils benefit from added organic matter to improve water retention. The species tolerates periodic waterlogging better than many natives but grows poorly in permanently wet sites⁴.

Site Selection and Preparation

Choose a position protected from strong winds which can damage young plants and reduce essential oil content in leaves. For hedging, space plants 1-1.5 metres apart; for specimen trees allow 3-4 metres from buildings and other plants. Prepare planting holes twice the width of the root ball and incorporate native plant fertiliser into the backfill soil. In frost-prone areas, select a north-facing position near a wall for added warmth and protection.

Planting Technique and Timing

Plant Cinnamon Myrtle in spring (September-November) in cooler climates or autumn (March-May) in subtropical areas. Avoid planting during extreme weather. Set plants at the same depth they were growing in containers – planting too deep causes stem rot. Water thoroughly after planting and maintain consistent moisture for 12 weeks while roots establish. Apply a 7-10cm layer of organic mulch, keeping it clear of the trunk.

Watch: Professional Planting Technique

Watering and Feeding Your Cinnamon Myrtle

Water Requirements Through the Seasons

Young Cinnamon Myrtles require regular watering during their first two years to establish deep root systems. Once established, they demonstrate good drought tolerance, requiring supplementary watering only during extended dry periods. In Brisbane and Sydney’s coastal areas, established trees often survive on rainfall alone except during drought. Melbourne and Adelaide gardens need weekly deep watering during summer. Signs of water stress include drooping leaves and premature leaf drop. Over-watering causes yellowing leaves and increases susceptibility to root diseases⁵.

Fertiliser Program for Healthy Growth

Cinnamon Myrtle has modest nutritional needs compared to exotic plants. Apply native plant slow-release fertiliser with low phosphorus content in spring and autumn. Use formulations specifically designed for Australian natives (N:P:K ratio around 17:2:10). Avoid high-phosphorus fertilisers which can cause toxicity in native plants. Supplement with liquid seaweed solution monthly during the growing season to encourage flowering and enhance aromatic oil production. For organic approaches, see our natural fertiliser guide⁶.

Pruning and Maintenance Schedule

Pruning for Shape and Harvest

Cinnamon Myrtle responds exceptionally well to pruning, making it ideal for formal hedges or shaped specimens. The best time to prune is immediately after flowering (late summer to early autumn) allowing time for new growth before winter. For hedging, trim 3-4 times annually to maintain density. When harvesting leaves for culinary use, take no more than one-third of the foliage at once. Young trees benefit from formative pruning to establish a strong framework – remove crossing branches and maintain a single leader for tree form, or encourage multiple stems for screening⁷.

Ongoing Care Requirements

Maintain a 10cm layer of organic mulch year-round to conserve moisture and suppress weeds. Refresh mulch annually in spring. Remove any dead or damaged branches promptly to maintain plant health. In windy locations, young plants may need staking for the first year. Container-grown specimens require repotting every 2-3 years using quality potting mix suitable for natives.

Troubleshooting Common Cinnamon Myrtle Issues

Why Are My Cinnamon Myrtle Leaves Turning Yellow?

Yellowing leaves typically indicate either nutrient deficiency or water-related stress. Iron deficiency causes yellowing between leaf veins while veins remain green – treat with iron chelates. Overall yellow leaves suggest nitrogen deficiency – apply native plant fertiliser. Over-watering in poorly draining soil causes root problems leading to yellow leaves. Ensure adequate drainage and reduce watering frequency. Natural leaf yellowing occurs on older foliage before dropping – this is normal if limited to lower, inner leaves.

Pest Management

Cinnamon Myrtle rarely suffers serious pest problems due to its aromatic oils that deter many insects. Occasionally, psyllids may cause pimple-like bumps on leaves – see our psyllid control guide. Scale insects sometimes appear on stressed plants – treat with horticultural oil or see our scale management guide. During humid weather, watch for myrtle rust (bright yellow pustules on new growth) – remove affected leaves immediately and improve air circulation⁸.

Disease Prevention

Root rot is the most serious disease threat, particularly in poorly draining soils. Prevent by ensuring excellent drainage and avoiding over-watering. Myrtle rust poses an increasing threat to Myrtaceae family plants in eastern Australia – select resistant plants from reputable nurseries and monitor regularly. Leaf spot diseases occasionally occur during prolonged wet weather but rarely require treatment beyond removing affected foliage.

Fascinating Facts & Culinary Uses of Cinnamon Myrtle

Historical and Cultural Significance

Indigenous Australians have long recognised the aromatic and medicinal properties of Backhousia species, using crushed leaves for treating colds and headaches. European settlers quickly adopted Cinnamon Myrtle as a cinnamon substitute when spices were scarce and expensive. During World War II, the leaves provided flavouring when imports were restricted. The commercial Australian native food industry has recently rediscovered Cinnamon Myrtle, with the dried leaves now exported internationally as a gourmet spice commanding premium prices in specialty food markets⁹.

Culinary Applications

Cinnamon Myrtle leaves contain approximately 3-6% essential oils, primarily elemicin and methyl eugenol, creating a complex flavour combining cinnamon and nutmeg notes. Use fresh or dried leaves sparingly – they’re significantly stronger than conventional cinnamon. Add whole leaves to slow-cooked dishes, removing before serving. Ground dried leaves work brilliantly in baking, requiring only one-quarter the amount of regular cinnamon. The leaves make exceptional tea, either alone or blended with other herbs. Commercial producers extract essential oil for flavouring confectionery, beverages and savoury products.

Wildlife and Ecological Benefits

Cinnamon Myrtle flowers attract numerous native pollinators including native bees, hover flies and beneficial wasps. The dense foliage provides nesting sites and shelter for small birds. Seeds are eaten by native pigeons and parrots. The tree supports various butterfly species whose caterpillars feed on the leaves. As a pioneer species in rainforest regeneration, it helps restore degraded land while providing habitat for recovering ecosystems.

Garden Design Ideas with Cinnamon Myrtle

Landscape Applications

Cinnamon Myrtle excels as a versatile landscape plant suitable for multiple design applications. Its dense growth makes it ideal for privacy screening, windbreaks and sound barriers along property boundaries. For formal gardens, clip into neat hedges or topiary shapes. In informal settings, allow natural growth for a relaxed Australian native aesthetic. The aromatic foliage makes it perfect for sensory gardens, particularly near pathways where brushing releases the fragrance. Use as a backdrop plant in mixed borders, where its dark green foliage highlights brighter flowering plants¹⁰.

Garden Styles Featuring Cinnamon Myrtle

• Native Gardens: Cornerstone species for Australian endemic plantings
• Edible Landscapes: Combines ornamental beauty with culinary harvest
• Rainforest Gardens: Creates authentic subtropical atmosphere
• Formal Gardens: Excellent for structured hedging and topiary
• Coastal Gardens: Tolerates salt spray in protected positions
• Bush Food Gardens: Essential for native food production

Small Space Solutions

Cinnamon Myrtle adapts well to container growing, though it requires large pots (minimum 50cm diameter) and regular pruning to maintain size. For courtyards and small gardens, maintain as a standard tree or multi-stemmed specimen at 2-3 metres height. In narrow spaces, espalier against walls or fences. The compact root system allows planting closer to structures than many trees of similar size.

Companion Plants for Cinnamon Myrtle

Native Plant Combinations

Create authentic Australian plant communities by combining Cinnamon Myrtle with complementary natives that share similar growing requirements¹¹:

• Lilly Pilly varieties: Acmena smithii provides similar screening with colourful new growth
• Coastal Rosemary: Westringia fruticosa offers year-round flowers at lower levels
• Native Violet: Viola hederacea creates delicate groundcover beneath
• Lomandra species: Strappy leaves provide textural contrast
• Native ferns: Enhance rainforest atmosphere in shaded areas

Mixed Garden Combinations

While focusing on natives, Cinnamon Myrtle also combines well with climate-appropriate exotics. Mediterranean herbs like rosemary and lavender share similar water requirements once established. For tropical-style gardens, combine with gingers, heliconias and cordylines for dramatic effect. The neutral green foliage complements both hot and cool colour schemes.

Related Species and Native Alternatives

Other Backhousia Species

Alternative Native Screening Plants

For gardeners seeking alternatives with similar screening capabilities, consider Callistemon species for spectacular flowers, or explore the diverse native plant collection for region-specific options. Acmena smithii minor provides a more compact alternative for smaller spaces while maintaining dense screening.

Seasonal Care Calendar for Cinnamon Myrtle

Frequently Asked Questions About Cinnamon Myrtle

Related Australian Native Plant Guides

Final Thoughts on Growing Cinnamon Myrtle

Cinnamon Myrtle (Backhousia myrtifolia) represents the best of Australian native plants – combining ornamental beauty, practical functionality, and ecological value in one hardy, low-maintenance package. From its origins in the subtropical rainforests of eastern Australia to its place in modern gardens from Brisbane to Melbourne, this versatile species continues to prove its worth as an essential addition to Australian landscapes¹⁵.

Success with Cinnamon Myrtle comes from understanding its basic needs: well-draining soil enriched with organic matter, regular water during establishment, protection from severe frost when young, and occasional feeding with native plant fertiliser. Once established, it rewards minimal care with years of aromatic foliage, attractive flowers, and valuable harvests for culinary use. Whether grown as a privacy hedge, specimen tree, or container plant, Cinnamon Myrtle adapts to meet your garden’s specific requirements.

Beyond its practical benefits, choosing Cinnamon Myrtle supports local biodiversity by providing food and shelter for native wildlife while reducing reliance on exotic species. Its natural pest resistance and adaptation to Australian conditions mean less water, fewer chemicals, and minimal maintenance compared to imported alternatives. For gardeners seeking to create authentic Australian landscapes that are both beautiful and sustainable, Cinnamon Myrtle offers an ideal solution.

Ready to add this remarkable native to your garden? Visit Garden Variety for quality Cinnamon Myrtle plants and expert advice tailored to your local conditions. Text Danika on 0488 062 502 to discuss plant availability, sizing options, and specific growing advice for your garden’s unique requirements.

References

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2. Floyd, A.G. (2022). Rainforest Trees of Mainland South-eastern Australia. Terania Rainforest Publishing.
3. Australian National Botanic Gardens (2023). Growing Native Plants – Backhousia species. ANBG, Canberra.
4. Handreck, K. & Black, N. (2022). Growing Media for Ornamental Plants and Turf. UNSW Press.
5. Department of Primary Industries NSW (2023). Native Plant Water Requirements. NSW DPI.
6. Native Plant Society of NSW (2023). Fertilising Australian Native Plants. Sydney.
7. Harris, R. (2023). Pruning Australian Native Trees and Shrubs. Australian Horticulture, 45(3), 22-28.
8. Plant Health Australia (2023). Myrtle Rust Management Guidelines. Canberra, ACT.
9. Low, T. (2022). Wild Food Plants of Australia. Angus & Robertson, Sydney.
10. Thompson, J. (2023). Contemporary Native Garden Design. Murdoch Books, Sydney.
11. Greig, D. (2022). Australian Native Plants for Gardens. New Holland Publishers.
12. Cribb, A.B. & Cribb, J.W. (2023). Wild Medicine in Australia. Fontana Books, Sydney.
13. Clarke, M. (2023). Australian Bush Foods in Modern Cuisine. Food Australia, 75(2), 18-24.
14. Hardwick, S. (2022). Harvesting and Processing Native Aromatics. RIRDC Publication No. 22/045.
15. Spencer, R. (2023). Horticultural Flora of South-Eastern Australia: Volume 3. UNSW Press.