River birch is a handsome, often multi-stemmed, fast growing tree that is native to the central and southeastern United States. Its most notable ornamental feature is its beautiful peeling bark that appears in mixed shades on white, rust-orange, gray and brown. Like other birches, it has elongated catkins, which appear in spring, and its medium-green leaves turn a dirty yellow in the fall. Its seeds ripen in late spring, much earlier than other birch species.
This tree is a wise selection for wet soil sites, hence its name, but can tolerate locations with drier soils. This species is more tolerant of heat than other birches and is resistant to birch borers. One problem with river birch is its tendency to drop many fine branches on the ground, especially after storms. In residential yards, the smaller maturing cultivars make better landscaping options. (info source: Learn2Grow.com)
Genus - Betula
Species - Nigra
Common name - River Birch
Pre-Treatment - Required
Hardiness zones - 5 - 8
Height - 40'-70' / 12 - 21 m
Spread - 40'-60' / 12 - 18 m
Plant type - Medium tree
Vegetation type - Deciduous
Exposure - Full Sun, Partial Shade
Growth rate - Fast
Soil PH - Acidic, Neutral
Soil type - Clay, Loam, Sand, Well Drained
Water requirements - Wet Site
Landscape uses - Feature Plant, Shade Trees
Germination rate - 89%
Bloom season - Spring
Leaf / Flower color - Green, Light Green / Yellow, brown