Color: Blue Flower Size : 5-7″ (12-18cm) Flowering Period: July – September Mature Height: 8-12′ (2.5-3.5m) Pruning Group: C Planting Aspect: Sun/ Partial Shade USDA Zone: 4 Suitable For Container: Yes Foliage: Deciduous Price Group: Standard About Ascotiensis Ascotiensis, named after the place where it was raised, the small town of Ascot in Berkshire, England has beautiful mid blue flowers with white stamens. At 5-7″ (12-17cm) these gorgeous flowers are very large especially for a continuous summer bloomer. Pruning group C.