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 viscosissimum It is said to cause violent vomiting shortly after ingestion. Ribes viscosissimum Ribes viscosissimum is a North American species of currant known by the common name sticky currant. It is native to western Canada and the western United States from British Columbia and Alberta south as far as California, Arizona, and Colorado. "Ribes viscosissimum" grows in mountain forests, streambanks, and plateau sagebrush. It is a spreading to erect shrub growing one to two meters (40-80 inches) in height, its stem coated in sticky glandular hairs but lacking spines and bristles. It is resinous and fragrant. The highly glandular leaves have