Color: Bicolor Flower Size: 6-8″ (15-20cm) Flowering Period: May & June Mature Height: 6-9′ (2-3m) Pruning Group: B1 Planting Aspect: Sun/ Partial Sun/ Bright Shade USDA Zone: 4 Suitable For Container: Yes Foliage: Deciduous Price Group: Standard About Barbara Dibley Barbara Dibley has soft reddish-mauve flowers that bloom in the spring and fall. Its bold color holds perfectly in partial shade. It has 6-8″ (15-20cm) flowers, in May, June and Sept. Mature height 6-9′ (2-3m). Pruning group B1.