Himalayan blackberry is mostly biennial and reproduces by seed, vegetatively by rooting at stem tips to form daughter plants, and sprouts from root buds. (0.9-2.4 cm) long and are palmately compound with 5 leaflets. Foliage The leaves of the prima cane (first year shoots) are 2.8-7.9 in. Himalayan Blackberry has been listed as an invasive species since 2009. HIMALAYAN BLACKBERRY Rubus procerus* Rose Family . Canes can grow up to 10 feet tall with trailing canes reaching up to 40 feet in length. Stems grow to 15 ft. (4.6 m) before arching and trail the ground for up to 40 ft. (12.2 m). Appearance Rubus armeniacus is a perennial shrub, that is native to Eurasia. Apr 26, 2015 - Himalayan Blackberry (Rubus armeniacus or Rubus discolor) Identification, Impacts and Noxious Weed Status in King County, Washington. Finley National Wildlife Refuge. European Botanic Gardens Consortium, 2014. Flowers: Blackberry flowers are white to pinkish, and consist of 5 stalked petals.They are approximately 2.5cm in diameter, and flowers are arranged in clusters of 5 to 20. The flower stalks are woolly and prickly. Comparing Himalayan blackberry (Rubus armeniacus) management techniques in upland prairie communities of the W.L. Himalayan blackberry is a tall semi-woody shrub, characterized by thorny stems and dark edible fruits. It grows upright on open ground and will climb over and trail over other vegetation. . Himalayan blackberry can be distinguished by its smaller flowers ( 2-3 cm across ), erect and archy stems, and its 3-5 oval leaflets with whitew hairs. Young canes arch as they grow longer, eventually reaching the ground and rooting at the nodes. Blackcap ( Rubus leucodermis ) a less common native, can be distinguished by its paler green-blue erect stems, purple fruits, and leaves that have fine white hairs underneath. 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