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Kowhai

Sophora microphylla

Also called Small Leaved Kōwhai, Weeping Kōwhai, Small Leaved Kowhai

Kowhai
Photo: John Barkla, CC BY 4.0

Kōwhai is a small to medium New Zealand tree (up to about 25 m) known for its drooping yellow spring flowers and weeping branches. It grows best in a sunny, open spot with free-draining soil.

Family
Fabaceae (Pea & bean family)
Grows as
Tree
Light
Full sun, Part shade
Water
Water regularly while establishing, then reduce to occasional deep watering once mature.
Soil
Well-drained soil; tolerates a range of soil types.
Temperature
Hardy to around -10 °C; protect young plants from hard frost.
How easy
Easy
Safety
Toxic: All parts are poisonous, especially the seeds, which contain alkaloids that can cause nausea, vomiting and more serious effects if eaten.
Native range
New Zealand, C. & S. Chile
Climate
temperate

About

Sophora microphylla, commonly known as kōwhai, weeping kōwhai, and small-leaved kōwhai, is a species of tree in the family Fabaceae. It reaches 25 metres (80 feet) in height, with a trunk up to 90 cm (35 in) in diameter. It is endemic to New Zealand; its range mainly covers the South Island, but is also present in the North Island. S. microphylla is found in various habitats. The species is known for its vibrant, yellow, drooping flowers and weeping branches.

Sophora microphylla was first described by the Scottish botanist William Aiton in 1789. S. microphylla is pollinated by birds; the tūī (Prosthemadera novaeseelandiae) are especially attracted to the flowers, and will travel long distances in search of them. The seeds are dispersed by gravity, wind, or by water. All parts of the plant, especially the seeds, are poisonous.

Where it grows

Sophora microphylla's seeds are dispersed by gravity, wind, or by water. The seed pods of the Sophora genus can travel long distances in water through transoceanic dispersal. S. microphylla is pollinated by birds; the tūī (Prosthemadera novaeseelandiae) are especially attracted to the flowers and are the primary pollinator of the species. They will also travel long distances in search of it and defend the tree from other birds. Other birds, such as the New Zealand bellbird (Anthornis melanura), kākā (Nestor meridionalis), and silvereyes (Zosterops lateralis) also visit the flowers, either for nectar or pollen, as the flowers produce large amounts of nectar.

Uses

The vibrant, yellow, flowers of the New Zealand kōwhai (Sophora sp.) are well-known and are unofficially recognised as the national flowers of New Zealand, having been a common subject of artwork and a national symbol for the country. Despite their potential toxicity, the plants have been used by indigenous Māori people and European settlers for timber, medicine, cultivation, and in other practices. Māori used the durable, hardy timber for a wide range of purposes, including using it in the making of canoe paddles, farming tools, and weapons. Its strength made it suitable for digging sticks and weapons, while its flexibility made it useful for bird snares and eel spears. The timber was also used in building houses and for fencing.

Other Sophora plants

Sophora alopecuroides · Shrubby sophora · Yellow necklacepod · Necklacepod

Text excerpted from the Wikipedia article Sophora microphylla by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.

The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.

Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.

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