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Isu tree

Distylium racemosum

Flower
Foliage
Isu tree

In its native Japanese oak forests it reaches the canopy. In a garden, it settles into a refined, steadfast evergreen with flowers unlike anything else in the witch hazel family.

Distylium racemosum is an evergreen large shrub or small tree from the forested slopes of Asia, where it grows among oaks at elevations above 3,000 feet and can, in time, reach 60 feet or more. In temperate gardens outside its homeland it is a far more manageable 10 to 15 feet, making it well suited to use as screening, a woodland backdrop, or an architectural anchor in a foundation planting. The flowers are distinctly strange: no petals at all, just a five-parted red downy calyx bristling with vivid purple stamens. They appear in spring and make little effort to be showy, but up close they are genuinely beautiful.

This species does best in a sheltered position out of cold, driving winds, with a half-shaded aspect and moist, sandy loam soil. The wood is exceptionally hard and dark in its native range, valued there as timber — a fact that speaks to the solidity of its constitution. Like the hybrid distyliums, it is resistant to most insect pests and diseases, requiring minimal pruning and next to no intervention once established.

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Zone7 - 10
TypeShrub
FoliageEvergreen
GrowthSlow
Height10 - 15 ft
Spread3 - 6 ft
BloomSpring
MaintenanceMedium
SunPartial shade
SoilClay
DrainageGood drainage
FormMulti-stemmed
TextureMedium
PropagationSeed
DesignFoundation planting
FamilyHamamelidaceae
LocationsNaturalized Area
Garden themesCottage Garden
Palettes