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Scrambling, very thorny, semi-erect shrub that is usually deciduous, with large root crowns and long suckers. Stems arching (occasionally semi-prostrate), entangled, green or red and occasionally layering. Variously shaped (usually cut-edged), flat leaves are arranged alternately on the stems. White to pink 5-petalled flowers appear from November to April followed by clusters of black berries from November to May.
Forms dense, long-lived clumps, scrambles over the ground and low plants, has an extensive rhizome system, occasionally layering and seeding. Tolerates most soil types, drought and flood but is intolerant of dense shade. Mostly spread by rhizomes. Birds distribute seeds but they have a low germination rate. Low to moderate damage in open habitats. Smothers most low growing species, inhibiting the establishment of native plant seedings, and impedes access.
Bio control has been released in the past for blackberry