Grape (Vitis) Boskoop Glory Grape Boskoop Glory is an old variety, of grapevine it reliably produces a bumper harvest of tasty sweet black grapes. Perfect for picking and eating fresh straight from the vine or add to your desserts! A hardy, easy to grow vine, trail over walls, pergolas or arches. Pretty white flowers bloom from June to August, the foliage is noticeably large providing beautiful autumn colour. Height of cordon trained vine: 1.8m (6\'). Spread of cordon trained vine: 1.5m (5\'). Untrained plants may reach up to 8m (26\').