Root and Canopy

The Premier Network for Holisic Homesteaders

Home
/
Field Guide
/
American Elm (Ulmas americana)

American Elm (Ulmas americana)

Tree Facts

Foliage Persistence: Deciduous

Sexual Expression: Perfect (bisexual) flowers or occasionally polygamous

Lifespan: Typically 175–300 years; some trees >400 years recorded (Marks et al., 2017)

Growth Rate: Moderate to fast

Life Cycle: Perennial

Pollination: Wind-pollinated

Bloom Period: Early spring (March–April, before leaf-out)

Uses & Toxicity

Practical Uses: Valued for its strong, interlocking grain wood — used in furniture, flooring, hockey sticks, and barrel staves. Historically prized as a street and shade tree.

Medicinal Uses: Bark decoctions used traditionally by Indigenous peoples for treating fever and wounds; inner bark mucilage once used as a demulcent.

Toxicity: Non-toxic to humans and wildlife; however, decayed bark may host fungal pathogens responsible for Dutch elm disease (Ophiostoma spp.).

History & Folklore

Historical Notes: Once the most iconic street tree in North America, famously lining towns before Dutch Elm Disease outbreaks in the 20th century.

Symbolism: Represents resilience, dignity, and endurance — widely planted as a memorial tree in the U.S.

Cultural Notes: Used by Indigenous tribes for canoes and utensils; colonial settlers prized its wood for wagon hubs and tool handles.

Similar Species & Lookalikes

Slippery Elm (Ulmus rubra) – red-tinged inner bark, rougher leaves

Rock Elm (Ulmus thomasii) – corky wings on twigs

Siberian Elm (Ulmus pumila) – smaller leaves, invasive

Key References

Marks, C.O. et al. (2017). The ecological role of American elm in floodplain forests. USDA Forest Service.
Elias, T.S. (1970). The genera of Ulmaceae in the southeastern United States. J. Arnold Arboretum.
Wiegrefe, S.J. et al. (1994). Phylogeny of elms (Ulmus, Ulmaceae): molecular evidence. Systematic Botany.
Lamp, W.O. et al. (1994). Patterns among host plants of potato leafhopper. J. Kansas Entomol. Soc.
Sherman, S.L. & Giannasi, D.E. (1988). Foliar flavonoids of Ulmus in eastern North America. Biochem. Syst. Ecol.

Taxonomy

Kingdom: Plantae

Subkingdom: Tracheobionta

Superdivision: Spermatophyta

Division: Magnoliophyta

Class: Magnoliopsida (Dicotyledons)

Subclass: Hamamelidae

Order: Urticales

Family: Ulmaceae (Elm Family)

Genus: Ulmus L.

Species: Ulmus americana L.

Etymology:
The genus name Ulmus is the classical Latin name for elms, used by Pliny the Elder. The species epithet americana refers to its North American origin and widespread distribution (Elias, 1970).

Common Names:
American Elm, White Elm, Water Elm, Soft Elm, Florida Elm

Morphology and Structure

Overall Shape: Vase-shaped crown with broad, arching limbs and an open, spreading canopy

Mature Height: 60–100 ft (18–30 m), occasionally to 130 ft. (40 m) in rich soils

Mature Spread: 60–90 ft. (18–27 m)

Trunk Diameter: 3–6 ft. (0.9–1.8 m)

Bark: Dark gray, becoming deeply furrowed and divided into broad, flat ridges with age. Young bark smooth and grayish-brown.

Leaves: Simple, alternate, doubly serrate, ovate to oblong, 7–12 cm long. Asymmetrical base, acuminate tip; dark green and rough above, paler and smooth beneath; turn yellow in fall.

Buds: Ovoid, dark brown, often rusty-hairy, with overlapping scales.

Twigs: Slender, zigzag, brownish-gray; pith solid; leaf scars slightly notched.

Flowers: Apetalous, small, clustered in fascicles on short pedicels; perfect or occasionally unisexual; appear before leaves.

Fruit (Samara): Flat, circular to oval, papery-winged seed (1–2 cm), fringed margins, maturing in late spring (April–May).

Management & Propagation

Propagation: By seed (no dormancy, germinates immediately); vegetative propagation via root cuttings or grafting resistant cultivars.

Pests/Diseases: Highly susceptible to Dutch Elm Disease (Ophiostoma novo-ulmi, O. ulmi), Elm Yellows (phytoplasma), and Elm Leaf Beetle (Xanthogaleruca luteola). Resistant or tolerant cultivars include ‘Princeton,’ ‘Valley Forge,’ and ‘New Harmony.’

Management: Plant resistant varieties; maintain canopy health through pruning and sanitation; avoid root wounding to limit pathogen spread.

Ecology and Habitat

Habitat: Floodplains, bottomlands, and rich alluvial soils; dominant along rivers and lowlands.

Soil Preference: Moist, well-drained loams or silts; tolerates occasional flooding but not prolonged waterlogging.

Water Requirements: Moderate to high

Sun Requirements: Full sun to partial shade

Temperature Needs: Hardy to USDA Zones 2–9 (−45 to +38 °C)

Tolerances: Cold, periodic flooding, compacted urban soils; moderately tolerant of drought and pollution

Establishment: Rapid early growth; regenerates well from seed and stump sprouts

Range: Native to eastern and central North America — from Nova Scotia and Manitoba south to Florida and Texas

Conservation Status: Least Concern (IUCN), though natural populations have been decimated by Dutch Elm Disease

Ecological Benefits

Keystone canopy species in riparian forests; stabilizes soil and prevents erosion.
Provides nesting sites for birds and habitat for cavity-nesting mammals.
Samaras serve as early-season food for birds and small mammals.
Supports diverse insect communities (Lamp et al., 1994).
Plays a key role in post-floodplain succession (Marks, 2017).