Common Name:

General Information

Ribes ambiguum is a deciduous shrub with stout, sparsely branched stems. Often epiphytic on trees; it can grow up to 100cm tall[, ].
The plant is harvested from the wild for local use as a food.

Known Hazards

None known

Botanical References

, ,

Range

E. Asia - China (east Sichuan), central and southern Japan.

Habitat

Most commonly found growing as an epiphyte in moist moss on the branches of trees in mountain forests[, , ].

Properties

Edibility Rating
Habit	Deciduous Shrub
Height	0.60 m
Pollinators	Insects
Cultivation Status	Wild

Cultivation Details

Ribes ambiguum is very cold hardy, when dormant it can tolerate temperatures falling to around -20°c[].
Easily grown in a moisture retentive but well-drained loamy soil of at least moderate quality[, ]. Quite tolerant of shade though not fruiting so well in such a position[]. Prefers a cool sheltered position in a leafy soil[].
White pine blister rust, caused by the pathogen Cronartium ribicola, is a fungal disease that is native to Asia but has spread via human activity to many other regions, where it has become more virulent. It has a complex life-cycle that requires both currants (Ribes species) and white pines (Pinus species of the section Strobus) for the disease to spread. Whilst Ribes species can generally live with the disease (it has an annual life-cycle and infects the leaves only) Pinus species can be devastated by it (it becomes perennial and spreads through the tree). Young pines are far more susceptible than mature trees. In America the growing of certain Ribes species is banned in some areas in order to protect plantations of white pine species.
Plants in this genus are notably susceptible to honey fungus[].

Edible Uses

Fruit - raw or cooked[, ]. An acid flavour[], they are commonly eaten in areas where they grow wild[]. A reasonable size, the green, subglobose fruit can be 10 - 12mm in diameter[, ].

Medicinal

None known

Other Uses

None known

Propagation

Seed - best sown as soon as it is ripe in the autumn in a cold frame. Stored seed requires 3 months cold stratification at 0 - 9°c and should be sown as early in the year as possible[, ]. Under normal storage conditions the seed can remain viable for 17 years or more. Prick out the seedlings into individual pots when they are large enough to handle and grow them on in a cold frame for their first winter, planting them out in late spring of the following year
Cuttings of half-ripe wood, mid summer in a frame[].
Cuttings of mature wood of the current year's growth, preferably with a heel of the previous year's growth, late autumn to late winter in a cold frame or sheltered bed outdoors[, ].