American Basswood

Native to eastern North America across a vast range.

• Distributed from New Brunswick and Quebec south to Virginia and northern Georgia, west to eastern North Dakota, Nebraska, Kansas, and northeastern Oklahoma
• Most abundant in the Great Lakes states and the upper Mississippi Valley
• Found at elevations from sea level to approximately 1,000 meters
• A component of rich, mesic deciduous forests, often growing with sugar maple, beech, and white ash
• The name "basswood" comes from "bast," referring to the tough inner bark fiber used for rope and mats
• Known as "bast" in many Native American languages
• Historically one of the most important utility trees for indigenous peoples of the Great Lakes region

A large, stately deciduous tree with a broad, rounded crown.

Bark:
• Gray to gray-brown, developing long, narrow, flat ridges with age
• Smooth on young trees, becoming deeply furrowed in old specimens

Leaves:
• Alternate, broadly ovate to cordate (heart-shaped), 10 to 20 cm long and nearly as wide
• Dark green and smooth above, paler beneath with tufts of hair in vein axils
• Margins coarsely serrated (toothed)
• Turn yellow-green to pale yellow in autumn
• Among the largest leaves of any North American hardwood

Flowers:
• Produced in pendulous clusters of 6 to 20 flowers on a stalk attached to a narrow, leaf-like bract
• Individual flowers 10 to 12 mm, pale yellow, intensely fragrant
• Blooms in June to July for about 2 weeks
• Pollinated primarily by bees

Fruit:
• Small, round, nut-like drupes, 8 to 10 mm in diameter
• Gray, fuzzy, slightly ribbed
• Bract aids in wind dispersal in autumn

Form:
• 20 to 35 meters tall with trunk diameters commonly 60 to 120 cm
• Crown broadly rounded, often with several ascending main branches
• Frequently produces prolific stump sprouts

The American Basswood is an ecologically significant tree in eastern hardwood forests.

Habitat:
• Found in rich, moist, well-drained deciduous forests, especially on mesic upland sites
• Prefers deep, fertile loams and is associated with limestone-derived soils
• Tolerant of shade when young, eventually requiring canopy gaps to reach maturity
• Often found as a scattered component of maple-beech-basswood forest communities

Ecological interactions:
• Flowers produce enormous quantities of nectar — one of the most important summer honey trees in North America
• Basswood honey is distinctive: pale white with a sharp, peppery aftertaste
• Seeds eaten by squirrels, chipmunks, and numerous bird species
• Leaves browsed by deer and porcupines
• Supports over 150 species of Lepidoptera caterpillars
• Dense canopy provides nesting habitat for warblers, vireos, and other forest songbirds

Growth:
• Moderate growth rate, typically 30 to 60 cm per year
• Long-lived, surviving 150 to 200+ years
• Sprouts prolifically from stumps and root collar — often forming clumps
• Tolerates coppicing exceptionally well

A valuable shade tree for large landscapes and reforestation.

Site selection:
• Prefers deep, moist, fertile, well-drained loamy soils
• Full sun to partial shade
• Tolerates a range of soil pH from slightly acidic to alkaline
• Best in naturalized settings, large parks, and estate landscapes

Planting:
• Plant balled-and-burlapped or container-grown trees in spring or fall
• Prepare a wide planting hole, amending with compost if soils are poor
• Stake for the first growing season

Care:
• Water during dry spells for the first 2 to 3 years
• Very low-maintenance once established
• Prune in late winter or early spring during dormancy
• Relatively pest-free, though Japanese beetles and aphids can be problematic
• Susceptible to trunk rot in old or damaged trees
• Hardy in USDA zones 2 to 8

The American Basswood has been one of the most useful trees in eastern North America for millennia.

Wood:
• Soft, light, fine-grained wood — ideal for carving, turning, and whittling
• Used extensively by Native Americans for dugout canoes, bowls, masks, and totem poles
• Modern uses include piano soundboards, Venetian blinds, woodenware, and beekeeping equipment
• Premium carving wood for artists and craftsmen

Fiber:
• Inner bark (bast) produces exceptionally tough, flexible fiber
• Used by Native Americans for rope, twine, fishing nets, baskets, and woven mats
• One of the most important fiber plants in pre-Columbian North America

Food and drink:
• Flowers produce fine honey with a distinctive sharp flavor
• Young leaves edible and palatable in salads
• Flower tea used as a mild sedative and cold remedy

Ornamental:
• Excellent large shade tree for parks and estate plantings
• Often used in reforestation and wildlife habitat restoration