A blackberry bush is a thorny or thornless woody perennial plant in the Rubus genus, known for its aggregate fruit (blackberries) that ripen from red to glossy black, growing on arching canes (stems) that typically live two years, first as green 'primocanes' and then as flowering 'floricanes'. They thrive in full sun, well-drained soil, and often spread readily, forming dense thickets, with modern cultivars available for home gardens that are easier to manage.