Mexican Elm (Ulmus mexicana)

Mexican Elm

Ulmus mexicana

Its broad canopy offers cool shade, a quiet anchor in warm climates. Deciduous tree; common name: Mexican Elm.

Full sun
1–2/week
Moderate
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Plant Needs

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Sunlight Full sun to partial shade; tolerates brief periods of full sun in warm climates with adequate moisture
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Watering Water deeply when the top 10–15 cm of soil is dry; avoid frequent shallow watering to encourage deep root growth
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Temperature Hardy to light frost (-5°C); thrives in warm temperate to subtropical temperature ranges
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Characteristics

  • Leaf: Ovate to elliptic, 5–12 cm long, double-serrated margins, dark green upper surface with paler undersides
  • Flower: Small, apetalous, greenish-yellow, borne in dense clusters on bare branches
  • Bark: Gray-brown, developing flat, furrowed ridges as the tree matures
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Care Guide

Watering

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

Fertilization

Apply balanced slow-release fertilizer once to support spring growth. Use a low-nitrogen fertilizer to promote sturdy wood growth rather than excessive foliage

Eggshell powder topdressing:Crush dried, sterilized eggshells into fine powder; sprinkle 1–2 tbsp around the tree base and water in to release calcium gradually
Pruning
  • Prune dead, damaged, or crossing branches in late winter before new spring growth
  • Thin crowded inner branches to improve airflow and reduce disease risk
  • Shape the canopy in early spring to maintain a desired size and rounded form
  • Remove suckers from the base to direct energy to the main trunk
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: 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: Shade tree for urban parks and street planting; wood used for furniture and construction