American Holly (Ilex opaca)

American Holly

Ilex opaca

Glossy evergreen leaves and bright red berries bring winter cheer. Broadleaf evergreen tree; common name: American holly.

Full sun
1–2/week
Moderate
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Plant Needs

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Sunlight Full sun to partial shade; at least 6 hours of direct sun supports heavy berry production on female plants
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Watering Water deeply when the top 5–7 cm of soil is dry; avoid waterlogging to prevent root rot
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Temperature Hardy to -18°C; tolerates hot summer temperatures with consistent soil moisture
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Characteristics

  • Leaf: Leathery, spiny-margined, dark green glossy leaves; 5–10 cm long
  • Flower: Small, white, fragrant, dioecious (male and female on separate plants)
  • Fruit: Bright red drupes (berries) persist through winter on female plants
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Care Guide

Watering

Keep soil consistently moist during active growth; apply mulch to retain moisture

Fertilization

Feed with acidic, slow-release fertilizer once monthly. Use fertilizer formulated for acid-loving plants to maintain soil acidity

Coffee grounds compost tea:Use fully composted coffee grounds; dilute 1:20 for root drench to lower soil pH and add mild nutrients
Pruning
  • Prune in late winter to shape the tree and remove dead or crossing branches
  • Thin dense inner growth to improve airflow and light penetration for better berry production
  • Remove suckers at the base to maintain a single trunk form
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; contains saponins that cause gastrointestinal distress and lethargy

Humans: Ingestion of large quantities of berries may cause mild gastrointestinal upset

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Garden Uses & Culture

Culture: Symbolizes Christmas and winter festivity in North America; represents longevity and hope

Usage: Ornamental garden tree; berry-laden branches used in holiday floral arrangements