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Blackberry is a small round fruit that grows on a flowering shrub or a trailing vine. Blackberries may be black, dark red, or yellow. Each blackberry consists of a cluster of tiny fruits called drupelets, which grow around a core known as the receptacle. Blackberries are often confused with black raspberries. But the receptacles of blackberries, unlike those of black raspberries and other raspberries, are eaten with the rest of the fruit. Blackberries are eaten fresh or are processed for use in making jam, jelly, pies, preserves, and wine.

The United States is the leading producer of blackberries. The fruit grows wild in most Midwestern and Eastern states. Blackberries are also produced commercially in Arkansas, Michigan, Missouri, New York, Oklahoma, Oregon, Texas, Washington, and other states.

Growers produce blackberry plants by cutting 6-inch (15-centimeter) sections from blackberry roots and burying them in loose loam. The roots are placed in rows about 8 to 10 feet (2.4 to 3 meters) apart to ensure proper development of the fruit. Growers plant the root sections in early spring, and only fruitless stems develop during the first growing season. Fruit production starts the next year and reaches its peak in the fourth or fifth years. Most blackberry plants live 15 to 20 years.

Blackberries to be sold as fresh fruit are harvested by hand. Those to be sold for processing are harvested by machines that shake the fruit from the bush. More than 90 percent of the blackberries grown commercially in the United States are sold for processing.

Blackberry plants require special care to produce large crops of fruit. For example, growers prune the plants regularly. In addition, growers spray the plants with pesticides for protection against insects.

Scientific classification. The blackberry is a member of the rose family, Rosaceae. It is classified as genus Rubus. Wild blackberries are R. alleghenienses.