Great Laurel (Rhododendron maximum)

Great Laurel

Rhododendron maximum

Its broad evergreen leaves form a lush, year-round canopy. Large flowering shrub; common names: Great Laurel, Rosebay Rhododendron.

Partial sun
1–2/week
Moderate
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Plant Needs

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Sunlight Partial shade to filtered sunlight; avoid intense midday direct sun which can scorch leaves
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Watering Water deeply when top 5–7 cm of soil is dry; avoid waterlogging to prevent root rot
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Temperature Hardy to -20°C; prefers cool, moist conditions; avoid prolonged temperatures above 28°C
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Characteristics

  • Leaf: Leathery, dark green, oblong leaves; 10–20 cm long, with smooth margins and glossy upper surface
  • Flower: Clusters of 15–25 bell-shaped, white to pale pink flowers; 2–3 cm wide, with faint yellow inner petal spots
  • Stem: Woody branching stems with gray-brown bark; new growth covered in fine rust-colored hairs
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Care Guide

Watering

Keep soil consistently moist but not waterlogged; apply mulch to retain moisture

Fertilization

Apply acidic, slow-release fertilizer once in early spring. Use fertilizer formulated for acid-loving plants to maintain soil pH

Pine needle tea:Steep dried pine needles in water for 3 days; dilute 1:10 for root drench to maintain acidic soil pH; avoid over-application to prevent nutrient imbalance
Pruning
  • Remove spent flower clusters after blooming to encourage new growth and maintain plant shape
  • Thin overcrowded branches in late winter to improve airflow and reduce disease risk
  • Trim back damaged or diseased stems as needed; avoid heavy pruning which can reduce next year's flowering
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; ingestion leads to vomiting, weakness, and potential cardiac issues

Humans: Contains grayanotoxins; ingestion causes nausea, dizziness, and cardiac irregularities

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Garden Uses & Culture

Culture: Symbolizes resilience and mountain beauty in Appalachian folklore

Usage: Ornamental garden shrub; provides shelter and food for native wildlife