Color: Blue Flower Size: 4-6″ (10-15cm) Flowering Period: May, June & Sept Mature Height: 6-9′(2-3m) Pruning Group: B1 Planting Aspect: Sun/ Partial Sun / Bright Shade USDA Zone: 4 Foliage: Deciduous Suitable For Container: Yes Price Group: Standard About Will Barron Very free flowering. Clear mid blue 4-6″(10-15cm) blooms in May, June and September. Mature height 6-9′ (2-3m). Pruning group B1.