Color: Purple Flower Size: 4-6″ (10-15cm) Flowering Period: May, June & Sept Mature Height: 6-9′(2-3m) Pruning Group: B1 Planting Aspect: Sun/ Partial Shade USDA Zone: 4 Foliage: Deciduous Suitable As Ground Cover: Yes Price Group: Standard About Royalty Purple-blue 4-6″ (10-15cm) double blooms in May and June followed by single blooms later in the summer. Mature height 6-9′ (2-3m). Pruning group B1