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 viburnifolium green and shiny on their top surfaces, and lighter green or yellowish and leathery on the undersides. The leaves have glands which exude a sticky, citrus-scented sap. Clusters of deep red flowers bloom in late winter and into early spring. The plant yields small red fruits later in the spring. Ribes viburnifolium Ribes viburnifolium, is an uncommon North American species in the gooseberry family. It is known by the common names Catalina currant, Santa Catalina Island currant, island gooseberry and evergreen currant. "Ribes viburnifolium" is found in Southern California in the United States, especially on Santa Catalina Island in the