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 canthariforme a centimeter (0.2 inch) wide, coated in hairs. Ribes canthariforme Ribes canthariforme is a rare North American species of currant known by the common name Moreno currant. The plant is native to southern California, having been found in San Diego County, California (Laguna Mountains and surrounding slopes) and in western Riverside County (Elsinore and San Jacinto Mountains). It is a member of the local chaparral plant community. The most recent estimates indicate that there are about 70 individual plants remaining. Most of these occur on land within Cleveland National Forest, and since there are few serious threats the species is