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Blackberry (Rubus fruticosus aggregate), a strong-growing, deciduous bramble with very thorny stems and deliciously tart fruit. The fruit of commercially grown blackberries such as these is considerably larger than that of wild plants. The blackberry is widely naturalised in the temperate zones and often considered a weed. The specific status of the blackberry is undecided and it may be a natural hybrid of several Eurasian species.