Coastal Tree Daisy
Olearia solandri
This native plant, known as Coastal Tree Daisy(scientific name: Olearia solandri ), 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
Coastal tree daisy ( Olearia solandri ) forms tight, wind‑shorn domes on exposed headlands Discover more about native trees. Though formal rongoā references are scarce, its hardy, salt‑tolerant form embodies coastal whakatipu (growth) and shelter. Iwi and community plantings use O. solandri as a living wind‑filter and to stabilise friable cliff edges; in mixed plantings it protects less hardy taonga and supports pollinators across long, maritime flowering windows.Coastal Tree Daisy ( Olearia solandri ), also known as Solander's Tree Daisy, is an evergreen shrub or small tree native to New Zealand, particularly the North Island and northern parts of the South Island. It has an upright, bushy stature with square, yellow, sticky twigs and can grow up to 4 meters high. It is prized for its fine, silvery-grey foliage, which consists of small, narrow leaves (5-10 mm long) with a soft, felted texture and a downturned margin that are white underneath. In spring and summer, it produces delicate, small, white daisy-like flowers that attract pollinators. It is well-suited for coastal environments due to its tolerance of salt spray and wind. It thrives in fertile, well-drained soil in full sun and can handle chalky soils.
Quick Facts
| Scientific Name | Olearia solandri |
|---|---|
| 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 solandri 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
Coastal Tree Daisy is endemic to New Zealand, found in the North Island and the northern parts of the South Island. This species primarily inhabits coastal areas, thriving in dry, exposed conditions. It is highly resistant to maritime exposure, wind, and salt spray, and can tolerate free-draining soils. While predominantly coastal, it can occasionally be found inland or in estuary swamps. It prefers full sun to partial shade.
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 solandri 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 Coastal Tree Daisy
Cultivating Olearia solandri ( Olearia solandri ) 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 Solandri 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 solandri , 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
Collected by Banks and Solander, coastal tree daisy carries historic and botanical significance; planting it in coastal restorations showcases native wind- and salt-tolerant shrublands. Olearia solandri , also known as coastal tree daisy or Solander's tree daisy, holds cultural significance primarily through its ecological role and its connection to New Zealand's natural heritage. It is an evergreen shrub or small tree endemic to New Zealand, found in coastal areas of the North Island and the northern parts of the South Island. It is important for coastal ecosystem restoration, providing shelter and nectar for native insects and birds. Its hardiness, tolerance to salt spray and wind, and ability to thrive in well-drained coastal soils make it ideal for stabilizing coastal environments and for use in windbreaks and native plantings. The plant is known by the Māori name "takupurenga." Olearia solandri was among the first 350 species collected by botanists Joseph Banks and Daniel Solander during Captain James Cook's first voyage, and the species was named after Daniel Solander. While it has significant ecological value and a recognized Māori name, specific traditional edible or medicinal uses by Māori have not been widely documented in standard references.
- 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 solandri ( Olearia solandri ), 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
Olearia solandri , also known as the coastal tree daisy or Solander's tree daisy, is an evergreen shrub or small tree native to New Zealand. It is prized for its silvery-grey foliage and delicate white daisy-like flowers, making it suitable for coastal gardens, windbreaks, and native plantings due to its tolerance to salt spray and wind. This species plays an important role in stabilizing coastal environments and provides nectar for native pollinators. While the NZPCN lists "Current conservation status" as a category for Olearia solandri , a specific current conservation category is not stated here. However, its ecological value and hardiness suggest it is a significant species for coastal ecosystem restoration.