The taxonomic history of Prunus is long and complicated, in part due to the economic value of its fruit crops and also the ease with which some species hybridize. Here, Prunus is circumscribed in its broad sense based on the argument that when viewed on a worldwide scale, the morphologic discontinuities among the segregate genera diminish and they overlap with one another. Included here are species that have at times been placed in the genera Amygdalus, Armeniaca, Cerasus, Laurocerasus, Padus, and Persica.
At the species level, Prunus has been the object of the usual combining and splitting common among taxonomists with different philosophies and opinions. In particular, over-reliance on the indument of various vegetative and floral parts has led to the naming of numerous species and infraspecific taxa. Similarly, too much has been made of fruit colour and palatability in naming taxa of Prunus. It is very likely that, as molecular and genetic data are analyzed and, more importantly, correlated with morphological data, circumscriptions will be redrawn and the number of Prunus species will be reduced[].

Common Name: Peach Plum

General Information

Prunus ussuriensis is a deciduous shrub or small tree that can grow 250 - 300cm tall, occasionally reaching 550cm[, ].
The plant is commonly harvested from the wild for local use as a food, and is sold in local markets[]. It is often cultivated in northern China and eastern Russia as a very cold-tolerant fruit crop.
There is currently insufficient information available to evaluate this species. The plant is classified as 'Data Deficient' in the IUCN Red List of Threatened Species(2013)[].

Known Hazards

The plant (especially the seed and young shoots) contains cyanogenic glycosides, especially amygdalin and prunasin. When injested, these compounds break down in the digestive tract to release cyanide. Used in small quantities in both traditional and conventional medicine, this exceedingly poisonous compound has been shown to stimulate respiration, improve digestion, and promote a sense of well-being[]. It is also claimed by some to be of benefit in the treatment of cancer - though this claim has been largely refuted.
In larger concentrations, however, cyanide can cause gasping, weakness, excitement, pupil dilation, spasms, convulsions, coma and respiratory failure leading to death[].
The fruits and flowers of most members of this genus generally have low or very low concentrations of this toxin, though the seeds and young shoots can contain much higher levels.
The levels of toxin can be detected by the level of bitterness:- for example sweet tasting almond seeds are a major food crop and are often eaten in quantity, whilst bitter tasting almond seeds are used as a flavouring (in marzipan for example) but are not usually eaten on their own.
In general, it can be considered safe to eat any fruit or seed from species in this genus that either have a sweet flavour or are slightly bitter. Great caution should be taken, however, if the flavour is moderately to very bitter[].

Botanical References

,

Range

E. Asia - eastern Siberia, Russian Far East, northeast China

Habitat

Forest margins and beside streams; at elevations from 400 - 800 metres[].

Properties

Conservation Status	Data Deficient
Edibility Rating
Medicinal Rating
Other Uses Rating
Habit	Deciduous Shrub
Height	2.50 m
Pollinators	Insects
Cultivation Status	Cultivated, Wild

Cultivation Details

Prunus ussuriensis is an extraordinarily frost-resistant species, enduring temperatures down to -50°c in eastern Siberia and northeast China, and average temperatures for January (mid winter) of between -23° to -2 7°c[]
Thrives in a well-drained moisture-retentive loamy soil[, ]. Prefers some lime in the soil but is likely to become chlorotic if too much lime is present[]. Succeeds in sun or partial shade though it fruits better in a sunny position[, ].
This species is resistant to extreme cold and is cultivated in northern China and the Russian Far East as a frost hardy fruit tree[, ]. In eastern Siberia it accounts for about 70% of the total fruit-growing area[].
This species is probably no more than a variety or sub-species of Prunus salicina[]. Another report says that this species is crossed with Prunus salicina to produce commercial varieties[].
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[].

Edible Uses

Fruit - raw or cooked[74,1665]. The purplish red, ovoid, subglobose, or oblong fruit can be 15 - 25mm in diameter and contains a single large seed[].

Seed - raw or cooked. Do not eat the seed if it is too bitter - see the notes above on toxicity.

Medicinal

Although no specific mention has been seen for this species, all members of the genus contain amygdalin and prunasin, substances which break down in water to form hydrocyanic acid (cyanide or prussic acid). In small amounts this exceedingly poisonous compound stimulates respiration, improves digestion and gives a sense of well-being[].

Other Uses

A green dye can be obtained from the leaves[].
A dark grey to green dye can be obtained from the fruit[].

Prunus ussuriensis belongs to the primary Gene Pool of the Japanese Plum (Prunus salicina) and has the potential for use as a gene donor for crop improvement[]
A late-flowering species that is very frost-resistant, it is of great importance for breeding work for fruit growing in cold regions[].
The plant is of interest for crossing with Prunus salicina Lindl., the American species of plums and the Myrobalan prunes. Burbank, Hansen and other breeders have produced several such varieties in America[].

Propagation

Seed - requires 2 - 3 months cold stratification and is best sown in a cold frame as soon as it is ripe[]. Sow stored seed in a cold frame as early in the year as possible[]. Protect the seed from mice etc. The seed can be rather slow, sometimes taking 18 months to germinate[]. Prick out the seedlings into individual pots when they are large enough to handle. Grow them on in a greenhouse or cold frame for their first winter and plant them out in late spring or early summer of the following year.
Cuttings of half-ripe wood with a heel, mid summer in a frame[, ].
Softwood cuttings from strongly growing plants in spring to early summer in a frame[].
Layering in spring.