Winged Elm (Ulmus alata)

Winged Elm

Ulmus alata

Winged corky growths along branches, a quiet urban shade tree. Deciduous hardwood tree; common names: winged elm, wahoo elm.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; highly tolerant of urban pollution and compacted soil conditions
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Watering Water deeply during prolonged dry spells; drought-tolerant once established with mature root systems
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Temperature Hardy to extreme cold and summer heat; suitable for USDA hardiness zones 5–9
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Characteristics

  • Leaf: Small elliptical leaves with double-toothed margins; dark green foliage turns pale yellow in fall
  • Stem/Bark: Corky, wing-like outgrowths along young twigs; mature bark is gray-brown and furrowed
  • Flower: Tiny greenish-red clustered racemes that bloom before new leaves appear
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Care Guide

Watering

Water deeply every 7–10 days during dry periods to support new growth

Fertilization

Apply balanced slow-release fertilizer in early spring to support seasonal growth. Use low-nitrogen fertilizer to prevent excessive foliage growth that may weaken branches

Composted eggshell powder:Sprinkle a thin layer around the tree's drip line in early spring to boost soil calcium and improve drainage; avoid raw eggshells to prevent pest attraction
Pruning
  • Remove dead, damaged, or crossing branches in late winter to early spring before new growth emerges
  • Thin crowded inner branches to improve air circulation and reduce disease risk
  • Shape the crown lightly to maintain a balanced, spreading form; avoid heavy pruning that may stimulate weak regrowth
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA confirmed non-toxic to cats; no reported toxicity

Humans: Non-toxic to humans; no known adverse health effects from ingestion or contact

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental shade tree for urban streets and residential yards; wood used for furniture, tool handles, and fence posts