Korean Hackberry (Celtis koraiensis)

Korean Hackberry

Celtis koraiensis

Its dense foliage offers quiet shade like a green umbrella. Deciduous tree; common name: Korean hackberry.

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, compacted soil, and dry conditions
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Watering Water deeply and infrequently; drought-tolerant once established; avoid overwatering
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Temperature Hardy to -20°C; adapts well to temperate continental climates with cold winters
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Characteristics

  • Leaf: Ovate to elliptical, serrated margins, glossy green upper surface, pale pubescent undersides
  • Flower: Small, greenish-yellow, inconspicuous axillary clusters
  • Fruit: Round, dark purple drupes maturing in autumn; edible when fully ripe
  • Stem/Bark: Light gray, smooth when young, developing shallow fissures with age
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Care Guide

Watering

Water deeply every 7–10 days during prolonged dry spells

Fertilization

Apply balanced slow-release fertilizer once in early spring. Avoid over-fertilization to prevent excessive foliage growth

Composted coffee grounds:Mix fully composted coffee grounds into topsoil in early spring; avoid raw grounds to prevent soil acidity spikes
Pruning
  • Remove crossed, damaged, or diseased branches in late winter before new growth emerges
  • Thin dense inner foliage to improve air circulation and sunlight penetration
  • Shape young trees to establish a strong, balanced canopy structure
  • Remove root suckers to maintain a single trunk form
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats; no known adverse effects

Humans: Non-toxic; ripe fruits are edible for humans in small quantities

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental shade tree; ripe fruits provide food for birds and small wildlife