Definitions

Daimyo Oak

Daimyo Oak

Daimyo Oak (Quercus dentata; Japanese: カシワ; Chinese: 柞栎) is a species of oak native to Japan, Korea and China.

It is a deciduous tree growing up to 20-25 m tall, with a trunk up to 1 m diameter. Its foliage is remarkable for its size, among the largest of all oaks, consisting of a short hairy petiole, 1–1.5 cm long, and a blade 10–40 cm long and 15–30 cm broad, with a shallowly lobed margin; the form is reminiscent of an enormous Pedunculate Oak leaf. The leaves are often retained dead on the tree into winter. Both sides of the leaf are initially downy with the upper surface becoming smooth.

The flowers are produced in May; the male flowers are pendulous catkins. The female flowers are sessile, growing near the tips of new shoots, producing acorns 1.2–2.3 cm long and 1.2–1.5 cm broad, in broad, bushy-scaled cups; the acorns mature in September to October.

Cultivation and uses

It was introduced to the British Isles in 1830, where it is occasionally grown in botanical gardens. It is usually smaller in cultivation than in the wild, growing to a small angular tree or large irregular shrub. Notable specimens include one at Osterley Park 14 m tall and 1.5 m girth, and the largest, 18 m tall, at Avondale Forest Park, County Wicklow, Ireland.

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