Pittosporum
Pittosporum umbellatum
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Pittosporum umbellatum is a shrub to small tree with distinct umbel-like clusters of small flowers, followed by sticky-seeded capsules. A useful shelter and background plant in mild climates.
Identification
Pittosporum umbellatum is a shrub to small tree, characterized by its glossy, oval leaves arranged opposite to sub-opposite along the stems. Its most distinctive feature is the clusters of small, fragrant flowers, which are typically followed by woody capsules that split open to reveal sticky orange seeds. Distinguish it from other pittosporums by its unique inflorescence structure and specific leaf characteristics.
Quick Facts
| Scientific Name | Pittosporum umbellatum |
|---|---|
| Family | Pittosporaceae |
| Form | Shrub to small tree |
| Height | 2-8 m (varies with site) |
| Spread | 40-120 cm across |
| Water Needs | Low to moderate; free-draining soils |
| Light | Full sun |
| Frost Tolerance | Moderate |
| Salt Tolerance | Low to moderate |
| Growth Rate | Slow to moderate |
| Lifespan | Long-lived perennial |
Climate Suitability
Content for Pittosporum umbellatum ( Pittosporum umbellatum ).
| 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. It favours exposed slopes, screes or fellfields with thin, rapidly drained mineral soils, enduring intense radiation, wind and freeze-thaw cycles. On the coast it occupies sunny, wind‑prone sites with sandy or rocky substrates, where salt‑laden air and periodic drought limit competition. These preferences explain its patchy distribution and sensitivity to changes in hydrology, competition and disturbance regimes. Pittosporum umbellatum
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 umbellatum Populations of
How to Grow
Cultivation Requirements
Sun to part shade; free-draining soils. Water to establish; prune lightly after flowering. Protect from severe frosts in exposed sites.
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 umbellatum
Uses
Traditional and Modern Applications
Ideal for rock and gravel gardens that emulate alpine processes, or for specialised collections. Suited to sunny, maritime gardens with sandy or rocky soils where wind and salt are considerations.
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 umbellatum from fresh seed is a common method. 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 umbellatum 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
Coastal Kōhūhū (Pittosporum umbellatum) is a versatile shrub to small tree that serves as a useful shelter and background plant in mild climates. It thrives in sun to part shade and free-draining soils. Plant in the cool, moist months into weed-free ground. Water regularly during establishment; thereafter, only during extended dry periods. Protect from severe frosts in exposed sites, especially when young. Prune lightly after flowering to maintain form and encourage a dense canopy. Mulch with coarse gravel or woodchips while keeping the stem base clear. Light shaping prune helps maintain its natural character; avoid hard renovation cuts. This species is generally resilient and performs well with minimal intervention.
Pests and Diseases
Common Problems and Solutions
Good siting prevents most problems-sharp drainage and appropriate exposure are key. Crown and root rots arise if winter wet persists; keep crowns elevated and water moving. Protect young plants from browsing where deer, goats or rabbits are present.
Cultural Significance
Traditional Uses and Values
As part of coastal and lowland forest mosaics in parts of Aotearoa, P. umbellatum adds seasonal interest and fragrance to tracks and forest edges. Selecting eco‑sourced plants for restoration strengthens whakapapa connections and helps rebuild resilient native communities.
Bonus Tip
Expert Growing Advice
To maximize flowering and maintain a dense, compact form, plant Pittosporum umbellatum in a sunny, well-drained location and provide consistent moisture during its establishment phase. Minimal pruning, coupled with appropriate siting, allows this resilient native to thrive and showcase its natural beauty without intensive care.
