Answer: American elderberry (Sambucus canadensis) is the most commonly cultivated because it's more cold hardy than the European species (S. nigra). 'York', 'Adams', and 'Johns' are improved American species bearing black fruits. Sambucus nigra is marketed under the name 'European Elderberry'. One source is Raintree Nursery, 391 Butts Rd., Morton, WA 98356 (206) 496-6400.
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