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
Epicoccum nigrum (a of 0.99 to 0.97), growth is optimized at water vapour saturation. "Epicoccum nigrum" produces a variety of biomedically and industrially useful metabolites, including important antifungal agents and pigments, including: flavipin, epicorazines A and B, epirodin, epicocconone, and a variety of carotenoid pigments. "Epicoccum nigrum" has also been utilized in the biosynthetic manufacture of silver- and gold nanoparticles. A highly robust and ubiquitous fungus, "E. nigrum" has an almost global spread, occurring in the Americas, Asia, and Europe. Spores of "E. nigrum" have been cultured from a variety of environments, predominantly soil (i.e. peat, forest floor, raw humus, compost, tundra,