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Betula lenta

sweet birch

Betulaceae Eastern North America

Fragrant (moderate)

Native to North America

SunFull Sun – Part Shade

WaterMedium

HardinessZones 3–8

Overview

Betula lenta is a deciduous tree growing 40-70 feet (12-21 m) tall and 35-45 feet (11-14 m) wide, with a rounded to oval crown and a straight central trunk. Young bark is smooth, dark reddish-brown to near-black, marked with horizontal lenticels, and unlike paper birches it does not peel; with age it breaks into large irregular scaly plates. Scratched twigs and inner bark release a strong wintergreen scent from methyl salicylate, the historical source of oil of wintergreen. The ovate, double-toothed leaves are 2.5-4 inches (6-10 cm) long, dark green in summer and turning clear yellow in fall. Yellow-brown male catkins lengthen in April and May as the leaves emerge, followed by upright cone-like seed catkins that ripen in autumn. It grows in cool, moist, acidic, well-drained soils in full sun to partial shade and is native to the Appalachian region of eastern North America. The species is shallow-rooted and sensitive to heat, compaction, and prolonged drought, which limits its use in hot urban sites. The bronze birch borer can attack trees weakened by stress.

Native Range

Native to eastern North America, from Maine and southern Quebec south through the Appalachian Mountains to northern Georgia and Alabama. It grows on cool, moist slopes, ravines, and rocky woodlands.

Suggested Uses

Used as a shade or specimen tree in large yards, parks, and naturalized woodland edges in cool climates. It suits moist slopes and stream-side plantings where soils stay cool. The aromatic bark and yellow fall color give it seasonal interest in native and woodland gardens.

How to Identify

Identified by smooth, dark reddish-brown to blackish bark with horizontal lenticels on young trunks, breaking into scaly plates with age. Scratched twigs give off a distinct wintergreen odor, separating it from yellow birch, which has a fainter scent and shaggy peeling bark. Leaves are ovate, 2.5-4 inches (6-10 cm) long, with doubly serrate margins and a heart-shaped to rounded base.

Appearance

Size & Dimensions

Height40' - 70'

Width/Spread35' - 45'

Reaches mature size in approximately 30 years

Colors

Flower Colors

Foliage Colors

Fall Foliage Colors

Bloom Information

Bloom Period

~2 weeks

Spring

Yellow-brown male catkins elongate to 1.5-3 inches (4-8 cm) in April and May as the leaves unfold. The flowers are wind-pollinated and inconspicuous. Upright female catkins develop into cone-like seed structures that ripen and release winged seeds from late summer into fall.

Detailed Descriptions

Foliage Description

dark green, turning clear yellow in fall

Growing Conditions

Sun Requirements

SunFull Sun SunPartial Shade

Requires 4-8 hours of direct sunlight daily

• Full Sun: 6+ hours of direct sunlight

• Partial Shade: 3-6 hours of direct sunlight

• Full Shade: Less than 3 hours of direct sunlight

Soil Requirements

pH Range5.0 - 6.5(Acidic)

357912

Soil Types

loam sand

Drainagewell drained

Water & Climate

Water Needs

Medium

Frost Tolerance

hardy

Time to Maturity

moderate

Care & Maintenance

Care Guide

Grows in cool, moist, acidic, well-drained soils in full sun to partial shade. A soil pH of 5.0-6.5 suits it, and it performs poorly on hot, dry, or compacted ground. The shallow root system benefits from mulch and steady moisture, especially in the first few years and during summer drought. It is hardy in USDA zones 3-8 but struggles in regions with hot summer nights. Trees weakened by drought or stress are vulnerable to the bronze birch borer. It transplants most reliably as a young balled or container specimen in early spring.

Pruning

Pruning is done in summer or fall after the leaves mature, since birches bleed heavily from cuts made in late winter and early spring. Dead, crossing, or damaged branches can be removed to maintain structure. Heavy pruning is avoided because large wounds invite borers and decay.

✓ Toxicity

Non-toxic