Color: Blue Flower Size: 7-9″ (17-23cm) Flowering Period: May June & Sept Mature Height: 6-9′ (2-3m) Pruning Group: B1 Planting Aspect: Sun/ Partial Shade USDA Zone: 4 Suitable For Container: Yes Foliage: Deciduous Price Group: Standard About Lasurstern Deep-blue overlapping sepals and white stamens. Large 7-9″ (20-25cm) blooms in May, June and September. Mature height 6-9′ (2-3m). Pruning group B1.