Rubus coreanus, known as bokbunja[3] (Korean: 복분자), Korean blackberry,[3] or Korean bramble,[4] is a species of raspberry native to Korea, Japan, and China.[5] It produces edible berries (not 'true berries' in the botanical sense) that can be fermented into bokbunja ju (Korean: 복분자주), a Korean fruit wine (although the majority of fruit commercially grown for producing this drink are actually Rubus occidentalis, native to North America).[6][7][8][9]R. coreanus fruits are usually harvested between the May and July at peak harvest season. They can only be cultivated in a few areas in Korea[why?], different to Rubus occidentalis, which can be cultivated widely across the country.[10]
^Lee, M. J., Nam, J. H., Jeong, J. H., Rho, R. I., (2020). Effect of Plant Part, Extraction Method, and Harvest Time over Antioxidant Yield of Rubus coreanus. Pharmacognosy Magazine,16(5), 455–460. DOI: 10.4103/pm.pm_549_19