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 victoris Ribes victoris Ribes victoris is an uncommon North American species of currant known by the common name Victor's gooseberry. It is endemic to California, where it grows in the chaparral and woods of canyons in the San Francisco Bay Area and counties to the north, as far as Humboldt County. "Ribes victoris"is an erect shrub growing up to two meters (80 inches) in height, its stem coated in sticky glandular hairs and some bristles, with spines occurring at nodes. The hairy, glandular leaves are divided into a few lobes which are lined with teeth. The inflorescence is made up of