Color: Blue Flower Size: 1-2″ (3-5cm) Flowering Period: June-Sept Mature Height: 6-8′ (2-2.5m) Pruning Group: C Planting Aspect: Sun/ Partial Shade USDA Zone: 5 Suitable For Container: Yes Foliage: Deciduous Price Group: Standard About Crispa Crispa has a very interesting flower. It is a light pink-mauve to a purple blue bell shaped flower with white center. Summer blooming on a 6-8′ (2-2.5m) plant. Pruning group C.