Color: White Flower Size: 5-7″ (12-18cm) Flowering Period: May June & Sept Mature Height: 6-9′ (2-3m) Pruning Group: B1 Planting Aspect: Sun/ Partial Sun / Bright Shade USDA Zone: 4 Suitable For Container: Yes Foliage: Deciduous Price Group: Standard About Moonlight Cream-yellow with a primrose rib and yellow stamens. The 5-7″ (12-18cm) flowers are produced on a compact 6-9′ (2-3m) plant in May, June and often September. Pruning group B1.