Blackcurrant can damage both unopened and open flowers when the temperature falls below . The flowers at the base of the strig are more protected by the foliage and are less likely to be damaged. In midsummer the strigs of green fruit ripen to edible berries, very dark purple in colour, almost black, with glossy skins and persistent calyxes at the apex, each containing many seeds. An established bush can produce about 4.5 kilograms (10 pounds) of fruit each year. Plants from Northern Asia are sometimes distinguished as a separate variety, "Ribes nigrum" var. "sibiricum", of which "Ribes cyathiforme" is considered
Ribes oxyacanthoides Ribes oxyacanthoides Ribes oxyacanthoides is a species of flowering plant in the gooseberry family known by the common name Canadian gooseberry. Its various subspecies have common names of their own. It is native to North America, where it occurs in Alaska through much of Canada and the western and north-central United States. Subspecies: The subspecies were previously considered to be five separate species of plant. They intergrade in some regions. These subspecies are sometimes called varieties. In general, this plant is a deciduous shrub growing 0.5 to 1.5 meters (20–60 inches) in height. The ssp. "hendersonii" is sometimes smaller at