Color: Purple Flower Size: 3-4″ (8-10cm) Flowering Period: July-Sept Mature Height: 9-12′(3-4m) Pruning Group: C Planting Aspect: Sun/ Partial Shade USDA Zone: 3 Foliage: Deciduous Suitable As Ground Cover: Yes Price Group: 3 About Negritjanka The dark purple 3-4″ (9-12cm) flowers similar to but much darker than Jackmanii on a vigorous plant makes this a worthwhile addition. Bred at the Kiev Botanical Garden in the Ukraine. Blooming time is July through September. Mature height 9-12′ (3-4m). Pruning group C.