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 velutinum Ribes velutinum Ribes velutinum is a species of currant known by the common name desert gooseberry. It is endemic to the deserts and mountains of the Western United States. It is native to areas in Montana, Idaho, Washington, Oregon, Utah, Nevada, California, and Arizona), It grows in many types of habitat, including sagebrush scrub, pinyon-juniper woodland, and yellow pine forest. "Ribes velutinum" is a spreading shrub with a thick, arching, multibranched stem growing up to 2 meters (80 inches) long. Nodes along the stems are armed with spines which may reach 2 centimeters (0.8 inch) in length. These are spines,