Native frangipani

Hymenosporum flavum. Family Pittosporaceae. Tree.

Also called Australian frangipani, Sweetshade.

An evergreen tree native to eastern Australia and New Guinea, grown for its glossy leaves and fragrant flowers that open cream and deepen to yellow. It makes a useful shade or specimen tree in mild climates, but needs protection from hard frost and cold, drying winds; it is not a true frangipani.

Hardiness

USDA zones 9b to 11b

UK hardiness: H3 (half hardy, -5 to 1°C)

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Grows outdoors in the shaded zones. Select a zone to see what else grows there.

Native frangipani
Photo: Martin Rady
Native frangipani
Photo: Martin Rady
Native frangipani
Photo: Martin Rady

At a glance

Sun
Full sun to partial shade; flowering is usually best with plenty of sun. Choose a sheltered position.
Water
Water regularly while establishing. Established trees tolerate short dry spells, but grow and flower better with deep watering during prolonged dry weather.
Soil
Well-drained soil enriched with organic matter; tolerates sandy soil and loam, and clay that drains freely. Avoid waterlogged ground.
Height
20-40 ft (6-12 m) in gardens; potentially much taller in rainforest conditions
Spread
10-20 ft (3-6 m)
Flowers
Spring to early summer; fragrant tubular flowers open creamy white and age to golden yellow.
Foliage
Evergreen. Glossy, dark green, oblong leaves with paler undersides, carried on spreading branches.
Growth
Moderate to fast in warm conditions with adequate moisture
Care needed
Low

The year at a glance

  • Pollinators
  • Heat tolerant
  • Wildlife
  • Low allergen
  • Fragrant
JFMAMJJASOND
Flowers
Fruit
Plant

Northern hemisphere months. In Australia, shift them by six.

Difficulty
Hard
Toughness
Needs looking after

Will it suit your garden?

Pick your zone, country, light and whether you have pets.

Full sun is 6 or more hours of direct sun a day, part shade 3 to 6 hours, shade under 3.

How it grows

  1. Planting day

    7 ft (2 m)

  2. After 1 year

    8 ft (2.4 m)

  3. After 2 years

    9 ft (2.9 m)

  4. After 3 years

    11 ft (3.3 m)

  5. After 5 years

    14 ft (4.2 m)

About 16 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Good to know

Cats and dogs
Safe
Native to
Australia
Growth rate
Fast

Care

Jobs through the year

ProtectJan–Apr, Oct–Dec
Not hardy outdoors in zones 6–7; grow in a movable container and overwinter in bright, frost-free shelter.
WaterApr–May, Sep–Oct, every 7 days
Check sheltered container plants and water when surface compost dries; never leave standing in water.
WaterJun–Aug, every 3 days
Check containers frequently and water deeply when the surface dries; ground-grown trees need less.
WaterJan–Mar, Nov–Dec, every 14 days
Check overwintering plants and water sparingly as compost dries; do not let roots dry out completely.
MulchMay
Apply organic mulch over roots without covering the trunk base.
FeedApr–May
Apply a modest balanced slow-release feed if growth is weak or soil is poor.
PruneJun–Jul
After flowering, remove damaged or crossing branches and shape lightly; avoid hard pruning.
  • Water deeply through the first two growing seasons, allowing the surface soil to dry slightly between waterings.
  • Spread organic mulch over the root area, keeping it clear of the trunk.
  • Apply a modest amount of balanced, slow-release fertiliser in spring if growth is weak or the soil is poor.
  • Protect young trees from frost with horticultural fleece and shelter them from strong winds.
  • Stake only if the root ball moves in the wind; use flexible ties and remove the support once roots hold firmly.

Pruning. Prune lightly after flowering to remove damaged or crossing branches and guide the shape of young trees. Avoid regular hard pruning or topping, which spoils the natural framework.

Through the year

Spring
Plant once damaging frosts have passed, then water thoroughly and mulch.
Spring
Check new growth and feed lightly if the tree is struggling in poor soil.
Early summer
After flowering, remove damaged branches and make any light shaping cuts.
Summer
Water young trees deeply during dry spells and check that ties are not rubbing the bark.
Autumn
Remove unwanted seedlings and check mulch depth without piling it against the trunk.
Winter
Protect young plants during frosts and check that the root area is not remaining waterlogged.

In the garden

  • Use as a flowering specimen in a sheltered lawn or mixed border, allowing room for its mature canopy.
  • Place near a terrace or frequently used path where the flower scent can be enjoyed, without crowding paving or buildings.
  • Combine with evergreen shrubs and shade-tolerant groundcovers for a layered subtropical planting.
  • Use as a light shade tree in an Australian native garden with an understorey of lomandra and native violet.

Garden styles it suits: Australian native, Modern tropical, Woodland, Sensory garden, Luxury resort and Tropical.

Plant it with: Lomandra, Native violet, Kangaroo paw, Bird's nest fern, Clivia and Dianella.

Wildlife: The scented flowers attract bees and other nectar-feeding insects. The evergreen canopy provides shelter for small birds.

Problems to watch for

  • Frost damage: young leaves and shoots may blacken; protect young trees and wait until spring growth begins before removing damaged wood.
  • Root rot in wet soil: improve drainage before planting and avoid frequent watering where the soil remains wet.
  • Scale insects: inspect stems and leaf undersides; treat small infestations with horticultural oil according to the label.
  • Sparse growth or poor flowering in deep shade: choose a brighter position and avoid excessive nitrogen feeding.

Safety

Not known to be toxic to people, cats, dogs or horses, although species-specific safety information is limited. It is not an edible plant; discourage chewing of leaves, bark or seeds.

Where it spreads. Has naturalised outside its native range in south-western Western Australia, where it can escape into bushland. Remove unwanted seedlings near natural vegetation.

Easily confused with

  • Frangipani (Plumeria rubra)

    True frangipani has thick, succulent branches, milky sap and broad, waxy flowers. Native frangipani has slender woody branches, smaller tubular flowers and no milky sap.

  • Sweet pittosporum (Pittosporum undulatum)

    Sweet pittosporum has conspicuously wavy leaf margins, smaller cream flowers and orange capsules containing sticky seeds. Native frangipani has larger flowers that turn yellow and dry capsules containing winged seeds.

The name

Hymenosporum refers to the membranous wings of the seeds, flavum means yellow, and native frangipani refers to the flowers' resemblance in scent to those of true frangipani.

Propagation. Sow fresh seed in a warm, well-drained propagation mix. Semi-ripe cuttings taken in summer can also root with warmth and humidity, though success is variable.

Checked against open data

Accepted botanical name
Hymenosporum flavum
Native range
New Guinea, New South Wales and Queensland.

Sources: GBIF (CC BY 4.0) and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.

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