Hydrangea arborescens 'Annabelle' Annabelle is a beautiful white hydrangea, often producing heads over 10" in diameter. Unlike the better known blue and pink hydrangeas, Annabelle blooms every year even after severe pruning or intensely cold winters. The huge, white "drumstick" blooms appear in profusion without fail. Mass in a part shade area of the mixed shrub border for long-lasting and often spectacular summer bloom.