Color: Pink Flower Size: 6-8″ (15-20cm) 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 Proteus Over one hundred years old and still a favorite. Rosy-lilac 6-8″ (15-20cm) double blooms in May and early June, then single blooms through the summer. Mature height 6-9′ (2-3m) Pruning group B1.