Blackhaw Viburnum (Viburnum prunifolium)

Blackhaw Viburnum

Viburnum prunifolium

Its spring blooms and autumn berries blend woodland charm with year-round appeal. Deciduous shrub or small tree; common name: Blackhaw.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; full sun promotes best flowering and fruiting, while partial shade suits hot climates
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Watering Water deeply when the top 5–7 cm of soil is dry; drought-tolerant once established
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Temperature Hardy to -30°C; tolerates summer heat up to 35°C, with consistent moisture during extreme hot spells
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Characteristics

  • Leaf: Oval to oblong dark green foliage, turning reddish-purple in autumn
  • Flower: Fragrant flat-topped white cymes, 5–10 cm in diameter
  • Fruit: Blue-black drupes ripening in autumn, attractive to wildlife
  • Stem: Gray-brown bark with shallow furrows on mature specimens
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Care Guide

Watering

Keep soil consistently moist during active growth; mulch to retain moisture

Fertilization

Apply balanced slow-release fertilizer once in early spring. Avoid high-nitrogen fertilizers to prevent excessive foliage growth over blooms

Banana peel compost tea:Compost banana peels for 2–3 months, steep in water for 24 hours, dilute 1:20 for root drench to avoid nutrient burn
Pruning
  • Remove dead, damaged, or crossing branches in late winter before new growth emerges
  • Thin overcrowded stems to improve airflow and light penetration
  • Shape lightly after flowering to maintain desired form; avoid heavy pruning that reduces next year's bloom buds
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA-verified non-toxic; no adverse effects reported

Humans: No known toxic effects from ingestion or contact

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Garden Uses & Culture

Culture: Symbolizes woodland resilience and wildlife support in native landscapes

Usage: Ornamental garden shrub; berries provide food for birds; historically used for traditional medicinal purposes