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 cereum to form a corolla-like structure. Inside there are minute white or pinkish petals, five stamens, and a two protruding green styles. The fruit is a rather tasteless red berry up to a centimeter (0.4 inch) wide, with a characteristically long, dried flower remnant at the end. The Zuni people use the berries of the "pedicellare" variety as food, and eat the leaves with uncooked mutton fat or deer fat. Ribes cereum Ribes cereum is a species of currant known by the common names wax currant and squaw currant ("R. c." var. "pedicellare" is known as whisky currant). It is native