Betula lenta, commonly called sweet birch, is a vigorous, fast-growing, native deciduous tree. In cultivation, it can be trained as either a single trunk or multi-trunked tree. As a single trunk tree, it develops a pyramidal habit when young, but matures to a more rounded shape typically growing 40-70' tall. Multi-trunked trees form a more irregular crown and are generally considered to be the superior growth habit for this species. Salmon-pink to reddish brown bark exfoliates to reveal lighter inner bark. Monoecious flowers appear in drooping, brownish male catkins and smaller, upright, greenish female catkins.
Easily grown average, medium to wet soils in full sun to part shade. River birch is perhaps the most culturally adaptable and heat tolerant of the birches. Prefers moist, acidic, fertile soils including semi-aquatic conditions, but also tolerates drier soils. Consider using soaker hoses and bark mulches to keep the root zones cool and moist. Adapts well to heavy clay soils of Missouri and will tolerate poor drainage. Avoid pruning in spring when the sap is running.
Zone: 4 to 9
Height: 40.00 to 70.00 feet
Spread: 40.00 to 60.00 feet
Bloom Time: April to May
Bloom Description: Brown (male) green (female)
Sun: Full sun to part shade
Water: Medium to wet
Other: Winter Interest
Tolerate: Deer, Drought, Clay Soil, Wet Soil, Black Walnut, Air Pollution