Rock Cotoneaster (Cotoneaster horizontalis)

Rock Cotoneaster

Cotoneaster horizontalis

Its flat, herringbone branches spread like a living tapestry. Low-growing evergreen shrub; common name: rock cotoneaster.

Full sun
1–2/week
Beginner
🌱

Plant Needs

☀️
Sunlight Full sun to partial shade; prefers partial shade in hot, arid regions to prevent leaf scorch
💧
Watering Water deeply when the top 5 cm of soil dries out; avoid overwatering to prevent root rot
🌡️
Temperature Hardy to -15°C; tolerates cold winters and mild summer heat, avoid prolonged temperatures above 30°C
🔍

Characteristics

  • Leaf: Small oval glossy dark green leaves; turn reddish-purple in winter
  • Flower: Clusters of tiny white to pale pink star-shaped blooms
  • Stem: Horizontal herringbone-patterned branches that root where they touch soil
  • Fruit: Bright red pea-sized berries that persist through winter
🛠️

Care Guide

Watering

Keep soil evenly moist during active growth; avoid waterlogging

Fertilization

Apply diluted balanced fertilizer once monthly. Use a low-nitrogen fertilizer to promote berry production

Eggshell powder topdress:Crush dried eggshells into fine powder; sprinkle 1 tsp per plant around the base and gently work into topsoil to avoid root disturbance
Pruning
  • Trim overgrown branches in late winter to maintain the herringbone growth pattern
  • Remove dead, diseased, or crossing branches to improve airflow and reduce pest risk
  • Thin dense growth to allow light penetration and encourage berry production
  • Trim rooted stems that spread beyond the desired planting area
⚠️

Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Contains cyanogenic glycosides; ingestion can cause vomiting, diarrhea, and respiratory distress

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

📖

Garden Uses & Culture

Culture: Symbolizes resilience and winter interest; often used in memorial gardens for its persistent berries

Usage: Ground cover for slopes, rock garden filler, and winter food for wild birds