Blackcurrant material from the gooseberry ("Ribes grossularia"), the red currant ("Ribes rubrum") and the flowering currant ("Ribes sanguineum"). The resulting offspring were further back-crossed to "R. nigrum". Cultivars produced include 'Tisel' and 'Tiben' in 2000 and 'Ores', 'Ruben' and 'Tines' in 2005. Further cultivars 'Polares' and 'Tihope' are being tested. Since 1991, New Zealand has become an important centre for research and development, as its temperate climate is particularly suitable for cultivation of the crop. Breeding programmes are concentrating on yield, large fruit size, consistency of cropping and upright habit. In North America, there is a need for this fruit to
Solanum nigrum to make 16-DPA progenitor); a possible commercial source could be via cultivating the hairy roots of this plant. Black nightshade is cultivated as a food crop on several continents, including Africa and North America. The leaves of cultivated strains are eaten after cooking. A garden form with fruit diam. is occasionally cultivated. Black nightshade can be a serious agricultural weed when it competes with crops. It has been reported as a weed in 61 countries and 37 crops. Herbicides are used extensively to control it in field crops such as cotton. Solanum nigrum Solanum nigrum (European black nightshade) is a