Himalayan giant blackberry

Rubus praecox is a vigorous bramble of the family Rosaceae belonging to the Rubus fruticosus aggregate of blackberries. It is a scrambling, semi-woody shrub forming dense thickets of arching, biennial canes that are strongly armed with stout, recurved prickles. The leaves are palmately compound, usually with three to five toothed, ovate leaflets that are green above and paler, often felted, beneath. Clusters of five-petalled white to pale pink flowers are produced in summer, giving way to aggregate fruits composed of many small drupelets that ripen from green through red to glossy black. Like other members of the aggregate it spreads aggressively by tip-rooting canes and seed, and it is widely naturalized beyond its native European range, where it can become invasive in disturbed land, hedgerows, and woodland edges.