Prickly Heath (Gaultheria mucronata)

Prickly Heath

Gaultheria mucronata

Its winter berries glow like tiny holiday ornaments. Evergreen low-growing shrub; common name: box-leaved waxberry.

Partial sun
1–2/week
Moderate
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Plant Needs

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Sunlight Prefers bright partial sun to full shade; avoid intense midday summer sun to prevent leaf scorch
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Watering Keep soil consistently moist but well-drained; avoid waterlogging and prolonged drought stress
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Temperature Hardy to -10°C; thrives in cool temperate conditions; avoid extreme heat above 28°C
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Characteristics

  • Leaf: Small, leathery oval leaves with a sharp mucronate tip; dark green evergreen foliage
  • Flower: Nodding bell-shaped flowers in white or pale pink; clustered in leaf axils
  • Fruit: Round persistent berries in red, white, or purple; ripen in autumn and persist through winter
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Care Guide

Watering

Maintain consistent soil moisture; water when top 1–2 cm of soil feels dry

Fertilization

Apply diluted acidic fertilizer every 6 weeks. Use a fertilizer formulated for acid-loving plants to support foliage and berry production

Composted coffee grounds tea:Use fully composted coffee grounds to avoid mold and odor; dilute 1:20 with water for root drenching to maintain soil acidity
Pruning
  • Remove dead or damaged branches in early spring to improve airflow
  • Thin dense growth to promote light penetration and berry production
  • Trim back overgrown stems after fruiting to maintain a compact mounding habit
  • Remove any yellowing foliage to prevent fungal growth
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA-verified toxic; ingestion of berries can cause vomiting, diarrhea, and abdominal pain

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

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Garden Uses & Culture

Culture: Winter berries are widely used in holiday floral arrangements for their long-lasting color

Usage: Ground cover for acidic soil gardens, container ornamental plant, or rock garden specimen