Shamrock Inkberry Holly (Ilex glabra 'Shamrock')

Shamrock Inkberry Holly

Ilex glabra 'Shamrock'

Dense evergreen foliage forms a neat rounded mound, ideal for low hedges. Compact broadleaf evergreen shrub; common name: Shamrock inkberry holly.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Thrives in full sun to partial shade; tolerates coastal salt spray and brief periods of drought once established
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Watering Keep soil evenly moist during establishment; reduce watering for mature plants and allow top 5 cm of soil to dry between waterings
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Temperature Hardy to USDA Zone 5; tolerates cold winters and warm, humid summers without significant stress
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Characteristics

  • Leaf: Small, glossy dark green, elliptical, evergreen, with no sharp spines
  • Flower: Inconspicuous white, fragrant, clustered in leaf axils (female plants require male pollinators for fruit set)
  • Fruit: Black, spherical drupes that persist into winter (female plants only)
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Care Guide

Watering

Maintain consistent soil moisture; apply mulch to reduce evaporation

Fertilization

Apply slow-release acidic fertilizer once to support new growth. Avoid high-nitrogen fertilizers that may promote leggy growth

Pine needle tea:Steep dried pine needles in water for 24 hours, dilute 1:10 with water, and apply as a root drench to maintain acidic soil conditions
Pruning
  • Trim lightly in late winter to maintain a compact, rounded shape
  • Remove dead, damaged, or crossing branches to improve airflow and foliage health
  • Thin overcrowded stems to promote dense, uniform growth for hedge plantings
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; contains saponins that may cause vomiting, diarrhea, lethargy, and abdominal pain

Humans: Ingestion of large quantities may cause mild gastrointestinal upset including nausea and diarrhea

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Garden Uses & Culture

Culture: Used as winter greenery in holiday decor in some North American regions

Usage: Low hedges, foundation plantings, and wildlife cover for birds that eat mature berries