Scented Tree Daisy
Olearia odorata
This native plant, known as Scented Tree Daisy(scientific name: Olearia odorata ), is a remarkable species endemic to New Zealand. It is characterized by its unique features, ecological role, and cultural significance. This comprehensive guide provides detailed information on its care, propagation, and importance within the New Zealand ecosystem. Understanding this plant contributes to the appreciation of our rich biodiversity and heritage, and supports conservation efforts for Browse All .
Plant Description
Identification and Physical Characteristics
Scented Tree Daisy ( Olearia odorata ) is a keystone of dry, open shrublands in Otago and Canterbury Discover more aboutNew Zealand. Its fragrant bloom clouds with insects on still evenings. While specific customary uses are rarely documented, modern kaitiaki efforts prioritise O. odorata for soil‑binding, stock‑exclusion plantings, and as a nurse shrub for rare herbs and invertebrates. Seed collection from remnant gullies helps conserve local genetic lines in restoration corridors.Scented Tree Daisy ( Olearia odorata ) is a small, divaricating shrub endemic to New Zealand, typically growing to a height of 2-4 meters. It has an open, twiggy, and often upright habit with many interlacing reddish twigs. Its leaves are small, light green, elliptical, often with a pale or silvery underside due to fine hairs. They are typically opposite and spathulate. It produces many small, white, intensely fragrant flowers in clusters during spring. These flowers are attractive to pollinators. It is a tough and resilient plant, able to withstand wind, drought, and coastal conditions. It thrives in well-drained soil and can tolerate full sun or partial shade.
Quick Facts
| Scientific Name | Olearia odorata |
|---|---|
| Height | 2-6 m |
| Spread | 2-4 m |
| Water Needs | Low to moderate |
| Light | Full sun to partial shade |
| Frost Tolerance | Moderate to good |
| Salt Tolerance | Moderate |
| Growth Rate | Moderate |
| Lifespan | Long-lived |
Climate Best Suited to
Olearia odorata is well adapted to various New Zealand regions.
Regional Suitability
| City | Climate Suitability |
|---|---|
| Auckland | High |
| Wellington | High |
| Christchurch | Medium |
Plant Habitat
Natural Occurrence and Ecology
Scented Tree Daisy is a small divaricating shrub endemic to New Zealand, particularly common in the lake district of Otago on the South Island. It thrives in dry, open areas east of the Main Divide, demonstrating adaptability to challenging conditions such as wind, drought, and coastal exposure. It prefers regions with moderate to low rainfall and good drainage. It is highly adaptable to various soil conditions, including dry, moist, poor, rocky, or sandy soils, and can tolerate different pH levels, though excellent drainage is preferred.
Growing Requirements
Soil Requirements
Prefers well-draining soil rich in organic matter.
- Well-drained
- Loamy
Light Requirements
Grows best in partial to full sun.
- Full Sun
- Partial Shade
Water Requirements
Requires regular watering during dry periods.
- Regular
- Drought tolerant once established
Planting and Establishing
Establishment Guidance
Plant Olearia odorata in a hole twice the width of the root ball.
Proper establishment is key to long-term success. Ensure the planting hole is twice as wide as the root ball and backfill with a mix of native soil and organic compost. Initial watering should be thorough, followed by regular monitoring during the first two growing seasons to ensure the plant becomes well-anchored and resilient to local climate fluctuations.
Ecological Role
Biodiversity and Ecosystem Impact
Provides habitat and food for native fauna.
This species plays a vital role in its local ecosystem, providing essential habitat and food sources for native biodiversity. Its presence supports complex ecological interactions, contributing to the overall health and stability of the environment. By planting this native, you help maintain the intricate web of life that defines New Zealand's unique natural heritage.
Uses & Significance
Garden Uses
Ideal for rock gardens and native borders.
- Rock gardens
- Ground cover
Ecological Value
Supports local pollinators.
- Birds
- Insects
The versatility of this plant makes it a valuable addition to many New Zealand gardens. Beyond its aesthetic appeal, it offers practical benefits such as soil stabilization and shelter for smaller plants. Its historical and modern uses highlight its enduring importance in both traditional practices and contemporary landscape design, making it a thoughtful choice for any restoration or gardening project.
Landscaping Uses
Adds texture and form to modern landscapes.
In a landscape setting, this plant provides excellent structure and year-round interest. Its unique form and foliage can be used to create focal points or as a cohesive element in a larger native planting scheme. It pairs well with other New Zealand natives, allowing for the creation of diverse and resilient garden environments that reflect the natural beauty of Aotearoa.
Seasonal Care Calendar
Spring
Mulch and apply balanced fertilizer.
- Fertilize
- Mulch
Summer
Water deeply during dry spells.
- Water
- Check for pests
Autumn
Tidy up any dead foliage.
- Prune lightly
- Plant new specimens
Winter
Protect from heavy frosts if necessary.
- Frost protection
When to Prune and How Much
Minimal pruning required to maintain shape.
- Remove dead branches
Always use clean, sharp tools.
Regular maintenance through careful pruning ensures the plant remains healthy and maintains its desired shape. Focus on removing dead or diseased wood to promote better air circulation and prevent the spread of pathogens. Proper pruning techniques help the plant direct its energy toward new growth, resulting in a more robust and aesthetically pleasing specimen in your garden.
How to Grow Scented Tree Daisy
Cultivating Olearia odorata ( Olearia odorata ) is a rewarding endeavor for any gardener interested in New Zealand's unique flora. This species can be propagated through several methods, each requiring specific conditions to ensure healthy growth and establishment. Successful propagation depends on mimicking the plant's natural environment and providing consistent care during the early stages of development.
From Seed
Propagation from seed is often the most effective way to produce a large number of Olearia Odorata plants. Seeds should be collected when they are fully mature. Freshly collected seeds generally have higher germination rates than those that have been stored for long periods.
Sow fresh seeds in a seed-raising mix.
- Collect seeds
- Sow in trays
Keep moist until germination.
From Cuttings
For those wishing to replicate specific characteristics of a parent plant, vegetative propagation via cuttings is the preferred method. This technique ensures that the new plants are genetically identical to the source. Semi-hardwood cuttings taken during the appropriate season usually yield the best results for this species.
Take semi-hardwood cuttings in late summer.
- Take cuttings
- Use rooting hormone
Additional Methods
Depending on the growth habit of Olearia odorata , other methods such as division or layering might also be viable options. Division is particularly suitable for plants that form dense clumps or have spreading root systems, while layering can be used for species with trailing or flexible stems.
Division can be done in early spring.
- Divide clumps
- Replant immediately
Pests & Diseases
Generally resistant to major pests.
While generally resilient, maintaining optimal growing conditions is the best defense against pests and diseases. Regular monitoring allows for early detection of any issues, which can often be managed through cultural practices or organic interventions. Ensuring good air circulation and appropriate watering will significantly reduce the plant's susceptibility to common environmental stresses and pathogens.
Cultural Significance
Scented tree daisy's evening fragrance and role in rare small-leaved Olearia shrublands make it a focus for public awareness plantings that connect communities with threatened dryland ecosystems. Olearia odorata , also known as the Scented Tree Daisy, holds significant cultural importance, particularly in New Zealand where it is endemic. Its significance stems from several key aspects. The plant is highly valued for its unique aromatic qualities, particularly its fragrant flowers. This makes it a popular choice for sensory gardens and fragrant plant collections. It serves as an "excellent habitat plant for small native birds and invertebrates" and provides "essential pollinator support," especially for nocturnal pollinators attracted to its evening fragrance. Its dense, bushy growth also offers shelter for small wildlife and contributes to New Zealand's native biodiversity. Due to its hardy nature, tolerance to various conditions (including coastal and exposed sites), and drought resistance once established, it is used for hedging, screening, or as a specimen planting. It can also be used in riparian plantings and forests. Olearia odorata is classified as an "At Risk - Declining" native shrub, highlighting its importance in conservation efforts within New Zealand. It is one of eight rare Olearia species included in the Small-leaved Tree Daisy National Recovery Plan, aiming to raise public awareness and encourage its protection and management.
- Traditional medicine
- Crafts
Bonus Tip
Excellent for low-maintenance gardens.
For an extra boost, consider applying a thin layer of high-quality organic mulch around the base of the plant. This helps retain soil moisture, suppresses weeds, and gradually improves soil structure as it breaks down. This simple step can make a significant difference in the plant's overall vigor and resilience, especially during periods of extreme weather.
Related Plants
Explore other native plants that share similar characteristics or habitats with Olearia odorata ( Olearia odorata ), offering further insights into New Zealand's diverse flora. These related species provide context and opportunities for complementary planting in your garden.
Plant Conservation
Conservation Status
The conservation status of Olearia odorata (Scented Tree Daisy) appears to have some conflicting information across sources.According to the NZPCN and Flora of New Zealand, its current conservation status as of 2017, and in previous assessments (2012, 2009, 2004), is "Not Threatened."However, other sources describe Olearia odorata as an important conservation species with an "At Risk - Declining" status, requiring conservation action. This classification highlights its importance for biodiversity, providing habitat for native moths and insects, some of which are entirely dependent on it.