Rubus sieboldii

Blume

Palm-leaf Dewberry

Rosaceae Edible: Fruit 86 iNaturalist observations

Has a deadly poisonous lookalike — see comparison below

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Summary

Rubus sieboldii, the Molucca raspberry, is a flowering plant in the genus Rubus. The species is native to Japan, including the Ryukyu Islands. The shrubs prefer low wetland areas, with very good sun exposure, though the plants can tolerate moderate shade.

Description

A deciduous hermaphrodite shrub with insect-pollinated flowers. Grows in light sandy, medium loamy, and heavy clay soils with good drainage. Tolerates mildly acid to basic and mildly alkaline pH. Suitable for semi-shade or full sun and prefers moist soil.

Edible Uses

The fruit can be eaten raw or cooked.

Medicinal Uses

None known.

Distribution

It is a temperate plant.

Where It Grows

Asia, Japan,

Cultivation

We have very little information on this species and do not know if it will be hardy in Britain, though judging by its native range it should succeed outdoors in many parts of this country. The following notes are based on the general needs of the genus. Easily grown in a good well-drained loamy soil in sun or semi-shade. Plants in this genus are notably susceptible to honey fungus.

Propagation

Seed requires stratification and is best sown in early autumn in a cold frame. Stored seed requires one month stratification at about 3°c and should be sown as early in the year as possible. Prick out seedlings when large enough to handle and grow on in a cold frame, then plant into permanent positions in late spring of the following year. Cuttings of half-ripe wood can be taken in July/August in a frame. Tip layer in July and plant out in autumn. Division can be done in early spring or just before leaf-fall in autumn.