Mexican Alder (Alnus jorullensis)

Mexican Alder

Alnus jorullensis

Its serrated leaves catch sunlight like scattered coins. Deciduous shade tree; common name: Mexican Alder.

Full sun
1–2/week
Moderate
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Plant Needs

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Sunlight Full sun to partial shade; tolerates urban pollution and windy coastal conditions
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Watering Water deeply during prolonged dry spells; drought-tolerant once established
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Temperature Hardy to mild frosts; thrives in temperate to warm, well-ventilated climates
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Characteristics

  • Leaf: Oval to elliptical, serrated margins, dark green upper surface, paler fuzzy underside
  • Flower: Male catkins are long, pendulous, and yellow-brown; female catkins are small, upright, and green
  • Stem/Bark: Smooth gray-brown bark when young, developing shallow fissures as the tree matures
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Care Guide

Watering

Water deeply every 7-10 days during dry periods

Fertilization

Apply balanced slow-release fertilizer once. Skip fertilization in nutrient-rich native soils

Eggshell powder topdressing:Crush dried eggshells into fine powder; sprinkle lightly on soil surface and water in to avoid clumping
Pruning
  • Remove dead or damaged branches in late winter before new growth emerges
  • Thin crowded inner branches to improve airflow and light penetration
  • Avoid heavy pruning; maintain the tree's natural upright form
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA-verified non-toxic to cats

Humans: No known toxicity to humans

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Garden Uses & Culture

Culture: N/A

Usage: Soil stabilization for riparian areas; ornamental shade tree in urban landscapes