Ribes nigrum

Blackcurrant cultivation was restricted starting in the early 1900s because Ribes nigrum serves as an alternate host for white pine blister rust, a fungal disease that devastated the American timber industry. The federal ban was repealed in 1966, but several states including Maine and Michigan still regulate where blackcurrants can be planted.

Blackcurrants contain roughly three to four times more vitamin C per 100 grams than oranges, making them one of the most concentrated natural sources among common berries. They are also exceptionally rich in anthocyanins, the pigments responsible for their deep purple-black color and valued as dietary antioxidants.

Poland is the world's leading producer of blackcurrants, with the United Kingdom also maintaining a significant commercial industry that supplies juice and beverage companies such as Ribena. Other notable producers include Germany, New Zealand, and France.

Yes, Ribes nigrum is hardy to approximately USDA Zone 3 or 4, tolerating winter temperatures well below zero Fahrenheit. However, prospective growers in the United States should verify local regulations, as some states still restrict Ribes cultivation to protect white pine forests.