Pittosporum
Pittosporum patulum
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Pittosporum patulum is a South Island species that inhabits montane shrublands and forest margins. Site protection and control of browsers and weeds are important for its recovery.
Identification
Shrub to small tree with opposite or sub-opposite leaves; flowers in clusters; sticky-seeded capsules. Compare leaf shape, venation and flower/fruit characters with related pittosporums.
Quick Facts
| Scientific Name | Pittosporum patulum |
|---|---|
| Family | Pittosporaceae |
| Threat Status | Nationally Vulnerable |
| Height | 2-8 m (varies with site) |
| Spread | 40-120 cm across |
| Water Needs | Moderate; avoid waterlogging |
| Light | Bright shade to dappled light |
| Frost Tolerance | Moderate |
| Salt Tolerance | Low to moderate |
| Growth Rate | Slow to moderate |
| Lifespan | Long-lived perennial |
Climate Suitability
Content for Pittosporum patulum ( Pittosporum patulum ).
| City | Climate Suitability |
|---|---|
| Whangārei | Suitable |
| Auckland | Suitable |
| Hamilton | Suitable |
| Tauranga | Suitable |
| Rotorua | Suitable |
| Gisborne | Suitable |
| New Plymouth | Suitable |
| Napier | Suitable |
| Whanganui | Suitable |
| Palmerston North | Suitable |
| Wellington | Suitable |
| Nelson | Suitable |
| Christchurch | Suitable |
| Dunedin | Suitable |
| Invercargill | Suitable |
Habitat
Natural Distribution
occurs in natural habitats characteristic of Aotearoa, forming part of distinctive plant communities where site stress and local disturbance shape vegetation patterns. On the coast it occupies sunny, wind‑prone sites with sandy or rocky substrates, where salt‑laden air and periodic drought limit competition. In forest it typically grows in bright shade at edges and canopy gaps, on fertile but free‑draining soils protected from extreme heat and desiccation. These preferences explain its patchy distribution and sensitivity to changes in hydrology, competition and disturbance regimes. Pittosporum patulum
Conservation Status
Current Threats and Protection
are influenced by land use, browsing and weeds. Protecting intact habitat mosaics, reducing browser pressure, and managing invasive plants sustain recruitment. Where local stands are small or isolated, eco‑sourced augmentation and careful site stewardship help secure long‑term viability. Pittosporum patulum Populations of
How to Grow
Cultivation Requirements
Provide a sheltered, sunny to lightly shaded site with free-draining soil. Mulch and water during dry spells; protect from frost when young. Prune lightly after flowering.
Planting Guide
Best Planting Practices
Plant in the cool, moist months into weed‑free ground. Set plants slightly proud of the surrounding soil, water to settle, and mulch with coarse gravel or woodchips while keeping the stem base clear. Grouping two to three plants replicates natural patterns and improves establishment under local conditions.
Ecology
contributes structure and seasonal resources where it grows, providing cover and habitat for invertebrates and, when flowering or fruiting, nectar, pollen or seed for fauna. By tolerating the stresses of its environment, it helps stabilise sites and enrich small‑scale habitat diversity. Pittosporum patulum
Uses
Traditional and Modern Applications
Suited to sunny, maritime gardens with sandy or rocky soils where wind and salt are considerations. Fits woodland and understory schemes beneath open canopies, especially in restoration plantings.
Landscaping Ideas
Combine with compatible natives to echo its natural associates, and use stony or leaf‑litter mulches to reinforce the intended microclimate. Avoid cramped beds; allow room for the plant’s mature form to read as a clear structural element.
Seasonal Care
Year-Round Maintenance
Spring: check ties and remove winter damage. Summer: water deeply but infrequently to promote deep roots. Autumn: refresh mulches and reduce irrigation as growth slows. Winter: ensure drainage and exposure are maintained, especially on heavy soils.
Pruning
Pruning Techniques
Little pruning is required; remove dead or crossing material after flowering and avoid hard renovation cuts. Light tip‑pruning maintains compact form without compromising the plant’s natural character.
How to Grow Pittosporum
From Seed
Propagation of Pittosporum patulum from fresh seed is a viable method, and crucial for its conservation. Collect seeds from ripe capsules in late autumn or early winter, once they begin to split open. Clean the sticky pulp from the seeds thoroughly, as this can inhibit germination. Sow fresh, cleaned seeds in late winter to spring onto a well-drained, free-draining seed-raising mix, lightly covering them. Maintain consistent moisture and grow on in high light with good air circulation. Germination typically occurs in spring and can be quite rapid once conditions are met. Once seedlings are robust enough to handle, prick them out into individual pots and grow them on in a sheltered, bright location until strong enough for planting out.
From Cuttings
Pittosporum patulum can be successfully propagated from semi-hardwood cuttings taken in late summer to early autumn. Select healthy, firm stem segments, about 10-15 cm long, from the current season's growth. Remove the lower leaves and dip the cut end in a rooting hormone to encourage root development. Insert the cuttings into a gritty, sterile, free-draining rooting medium such as a mix of sand and perlite. Provide gentle bottom heat (around 18-24°C or 65-75°F) and high humidity around the cuttings, either by placing them in a propagation chamber or covering them with a plastic bag. Keep in a warm, bright location out of direct sunlight. Rooting typically occurs reliably within 8-16 weeks. Once rooted, gradually acclimatize plants to ambient conditions before potting up.
General Cultivation
Patulum Pittosporum is a threatened montane pittosporum that requires a sheltered, sunny to lightly shaded site with free-draining soil. Mulch and water during dry spells; protect from frost when young. Prune lightly after flowering. Site protection and control of browsers and weeds are important for its recovery. Plant in the cool, moist months into weed-free ground. Set plants slightly proud of the surrounding soil, water to settle, and mulch with coarse gravel or woodchips while keeping the stem base clear. Grouping two to three plants replicates natural patterns and improves establishment under local conditions. In restoration, control weeds and browsing pressure; use eco-sourced plants where possible.
Pests and Diseases
Common Problems and Solutions
Good siting prevents most problems-sharp drainage and appropriate exposure are key. In still, shaded corners, sap‑suckers and sooty mould may appear; improve airflow and wash foliage if needed. Protect young plants from browsing where deer, goats or rabbits are present.
Cultural Significance
Traditional Uses and Values
A nationally vulnerable species of South Island montane shrublands and forest margins, Pittosporum patulum represents taonga flora whose persistence depends on kaitiakitanga in the form of site protection, weed control and careful browsing management. Using eco‑sourced material in restoration honours local whakapapa and helps re‑establish scented, flowering understorey communities.
Bonus Tip
Expert Growing Advice
Given its "Nationally Vulnerable" status, Pittosporum patulum thrives with site protection and minimal intervention. Prioritize planting in sheltered, sunny to lightly shaded locations with free-draining soil. Consistent weed control and protection from browsing animals during establishment are more crucial than intensive care.
