Oregon Grape (Berberis aquifolium)

Oregon Grape

Berberis aquifolium

Its spiny holly-like leaves frame bright yellow blooms, a hardy evergreen shrub. Common names: Oregon Grape, Holly Barberry.

Partial sun
1–2/week
Beginner
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Plant Needs

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Sunlight Prefers full sun to partial shade; full sun promotes heavier flowering and fruiting, while partial shade suits hotter regions
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Watering Water deeply when the top 5 cm of soil dries out; drought-tolerant once established, avoid waterlogging
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Temperature Hardy to -15°C; thrives in cool to temperate climates, avoid prolonged extreme heat above 32°C
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Characteristics

  • Leaf: Compound leaflets with spiny holly-like margins; glossy dark green foliage that shifts to bronze in winter
  • Flower: Fragrant clusters of bright yellow star-shaped blooms
  • Fruit: Blue-black grape-like tart berries ripening in late summer
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Care Guide

Watering

Keep soil evenly moist during active growth; avoid overwatering to prevent root rot

Fertilization

Apply a balanced slow-release fertilizer once at the start of growth. Avoid high-nitrogen fertilizers to prevent excessive foliage growth at the expense of flowering

Eggshell powder topdressing:Crush dried eggshells into fine powder; sprinkle 1–2 tbsp over soil surface to boost calcium levels and reduce blossom end rot risk
Pruning
  • Prune immediately after flowering to maintain compact shape and remove dead or damaged branches
  • Thin overcrowded inner branches to improve airflow and light penetration
  • Remove suckers at the base to control spread and preserve the plant’s desired form
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic due to berberine; ingestion causes vomiting, diarrhea, lethargy, and abdominal discomfort

Humans: Ingestion of large quantities of berries or bark may cause nausea, vomiting, or diarrhea due to berberine content

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Garden Uses & Culture

Culture: Symbolizes resilience in Pacific Northwest native plant gardens; used in traditional Indigenous herbal medicine for mild antimicrobial purposes

Usage: Ornamental garden shrub; tart berries used in small quantities for jams and jellies