Color: Blue Flower Size: 2-3″ (5-8cm) Flowering Period: April & May Mature Height: 8-12′ (2.5-3.5m) Pruning Group: A Planting Aspect: Sun/ Partial Sun / Bright Shade USDA Zone: 3 Suitable As Ground Cover: Yes Foliage: Deciduous Price Group: 2 About Macropetala Lagoon Deep blue 2-3″ (5-8cm) double open bell shaped flowers in April and May, followed by attractive seed heads. Mature height 8-12′ (2.5-3.5m). Pruning group A.