Prunus orthosepala

Koehne

Rosaceae Edible: Fruit, Seeds Potential hazards — see below 5 iNaturalist observations

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President and Fellows of Harvard College

Summary

Deciduous shrub growing to 6 m. Flowers in May. Hermaphroditic, insect-pollinated. Grows in light sandy, medium loamy, or heavy clay soils with good drainage. Tolerates mildly acidic to basic pH. Requires full sun and prefers moist soil.

Description

Edible Uses

The fruit can be eaten raw or cooked — it is juicy and palatable, with a single large seed inside. The seed is also edible raw or cooked, but should be avoided if it tastes too bitter due to potential toxicity.

Medicinal Uses

No specific research has been recorded for this species, but like all members of the genus it contains amygdalin and prunasin, compounds that break down in water to release hydrocyanic acid (prussic acid). In small amounts this highly poisonous substance can stimulate respiration, aid digestion, and produce a sense of well-being.

Known Hazards

Although no specific mention has been seen for this species, it belongs to a genus where most, if not all members of the genus produce hydrogen cyanide, a poison that gives almonds their characteristic flavour. This toxin is found mainly in the leaves and seed and is readily detected by its bitter taste. It is usually present in too small a quantity to do any harm but any very bitter seed or fruit should not be eaten. In small quantities, hydrogen cyanide has been shown to stimulate respiration and improve digestion, it is also claimed to be of benefit in the treatment of cancer. In excess, however, it can cause respiratory failure and even death.

Distribution

Temperate.

Where It Grows

North America, USA,

Cultivation

Thrives in a well-drained moisture-retentive loamy soil, growing well on limestone. Prefers some lime in the soil but is likely to become chlorotic if too much lime is present. Requires a sunny position. Most members of this genus are shallow-rooted and will produce suckers if the roots are damaged. Plants in this genus are notably susceptible to honey fungus.

Propagation

Seed requires 2–3 months of cold stratification and is best sown in a cold frame as soon as it is ripe. Stored seed should be sown in a cold frame as early in the year as possible. Protect seed from mice. Germination can be slow, sometimes taking 18 months. Prick seedlings into individual pots when large enough to handle, overwinter in a greenhouse or cold frame, then plant out in late spring or early summer the following year. Cuttings of half-ripe wood with a heel can be taken in July/August in a frame. Softwood cuttings from vigorous plants can be taken in spring to early summer in a frame. Layering can be done in spring.