Pictures shown are mature trees for sake of reference. 
This product is sold in seedling size (18-24") bundles of 25.
(Not full grown)
 
 
Ninebark is a cold hardy, tough, native shrub for mixed borders. Pinkish-white flower clusters in late spring, persistent seed capsules and exfoliating bark adds to the seasonal interest. Foliage of cultivars varies in size and color from purple to lime green.
 
Family (English): Rose
Family (botanic): Rosaceae
Tree or plant type: Shrub
Native locale: Chicago area, Illinois, North America
Size range: Low-growing shrub (under 3 feet), Small shrub (3-5 feet), Medium shrub (5-8 feet), Large shrub (more than 8 feet)
Light exposure: Full sun (6 hrs direct light daily), Partial sun / shade (4-6 hrs light daily)
Hardiness zones: Zone 2, Zone 3, Zone 4, Zone 5 (Northern Illinois), Zone 6 (City of Chicago), Zone 7
Soil preference: Acid soil, Alkaline soil, Moist, well-drained soil
Other tolerances: Alkaline soil, clay soil, Dry sites, Occasional drought, Occasional flooding, Road salt, Wet sites
Season of interest: midwinter, late winter, late spring, early summer, midsummer, late summer, early fall, mid fall, late fall
Flower color and fragrance: White
Shape or form: Arching, Mounded, Multi-stemmed, Round
Growth rate: Moderate
 
Excerpted from and for more information see this link: Morton Arboretum Common Ninebark