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AGATHIS robusta

Image of Agathis robusta

Kahuroa, Wikimedia Commons Contributor

Family

Araucariaceae

Botanical Name

AGATHIS robusta

Plant Common Name

Queensland Kauri

Special Notice

This entry has yet to be reviewed and approved by L2G editors.

General Description

Among the largest and oldest trees in the world, Queensland kauri's lance-shaped leaves, colrful flaking bark and massive trunk and canopy make it among the most magnificent trees for frost-free landscapes. A cone-bearing evergreen tree that is slow-growing, it is native to the drier rainforests of eastern Queensland in northeastern Australia. The whorling, horizontal branches become much more upward and spreading with age. Its tan, orange and light gray bark is speckled, shedding in large flakes.

The green young foliage can have reddish tints when first emerging. They are thin, leathery and lance-shaped, becoming dark green at maturity, held in opposite pairs. In spring, male and female cones appear in the same tree (although young trees tend to be one-gendered at first). Pollen is shed from the cylindrical male cones whilw the more rounded female cones are pollinated by the wind and become scaly, red-brown cones that shed winged seeds.

Grow Queensland kauri in full sun to bright dappled shade protected from chilly winds in any moist but well-draining soil that is deep and fertile. Soil should be drier in the winter. It will become a terrific lawn or campus specimen tree in regions free from frosts and are seasonally dry. In its native land this species is considered an endangered species because of historical timber exploitation.

Characteristics

  • AHS Heat Zone

    12 - 9

  • USDA Hardiness Zone

    9 - 12

  • Sunset Zone

    H1, H2, 24

  • Plant Type

    Tree

  • Sun Exposure

    Full Sun, Partial Sun

  • Height

    95'-130' / 29.0m - 39.6m

  • Width

    30'-45' / 9.1m - 13.7m

  • Native To

    Australia

Growing Conditions

  • Soil pH

    Acidic, Neutral

  • Soil Drainage

    Well Drained

  • Soil type

    Clay, Loam, Sand

  • Tolerances

    Drought

  • Growth Rate

    Slow

  • Water Requirements

    Drought Tolerant, Average Water

  • Habit

    Upright/Erect

  • Seasonal Interest

    Spring, Summer, Fall, Winter

Ornamental Features

  • Flower Interest

    None

  • Fruit Color

    Brown, Sienna

  • Foliage Color (Spring)

    Green, Dark Green

  • Foliage Color (Summer)

    Dark Green

  • Foliage Color (Fall)

    Dark Green

  • Foliage Color (Winter)

    Dark Green

  • Bark Color

    Orange, Tan, Sandy Brown, Ivory

  • Bark Color Modifier

    Multi-Color, Spotted/Mottled

  • Fragrant Flowers

    No

  • Fragrant Fruit

    No

  • Fragrant Foliage

    No

  • Bark or Stem Fragrant

    No

  • Repeat Bloomer

    No

  • Showy Fruit

    Yes

  • Edible Fruit

    No

  • Showy Foliage

    Yes

  • Foliage Texture

    Medium

  • Foliage Sheen

    Glossy

  • Evergreen

    Yes

  • Showy Bark

    Yes

Special Characteristics

  • Bark Texture

    Exfoliating

  • Usage

    Feature Plant, Shade Trees, Street Trees, Tropical

  • Sharp or Has Thorns

    No

  • Invasive

    No

  • Attracts

    Birds

  • Self-Sowing

    No