Nepal Alder (Alnus nepalensis)

Nepal Alder

Alnus nepalensis

Its catkins sway softly in spring, a quiet anchor for riparian ecosystems. Deciduous tree; common name: Nepal Alder.

Full sun
1–2/week
Moderate
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Plant Needs

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Sunlight Full sun to partial shade; thrives in open riparian sunlight, tolerates dappled shade in forest understories
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Watering Water deeply during extended dry periods; tolerates periodic flooding and moist soil conditions
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Temperature Hardy to -10°C; performs best in cool to temperate climates with mild summers
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Characteristics

  • Leaf: Ovate to elliptical, serrated margins, dull green upper surface, paler, fuzzy underside
  • Flower: Male catkins pendulous, yellow-brown; female catkins small, erect, green turning woody post-pollination
  • Stem/Bark: Smooth gray-brown bark when young, developing shallow fissures with maturity
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Care Guide

Watering

Maintain consistent soil moisture; avoid prolonged drought stress

Fertilization

Diluted balanced feed once monthly. Minimal fertilization needed due to nitrogen-fixing root nodules

Eggshell powder top dressing:Crush dried eggshells into fine powder; sprinkle 1–2 tbsp around the tree base; water lightly to work into topsoil
Pruning
  • Remove dead, damaged, or crossing 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 rounded canopy shape
  • Trim suckers at the base to prevent overcrowding
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: No listed toxicity to cats

Humans: No documented toxicity to humans

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Garden Uses & Culture

Culture: N/A

Usage: Riparian erosion control, nitrogen fixation for soil improvement, ornamental shade tree, firewood source