How to Grow Rusty Blackhaw Viburnum

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Rusty Blackhaw Viburnum

Viburnum rufidulum

shrub

Rusty Blackhaw Viburnum is a deciduous to semi-evergreen native shrub that produces fragrant white flower clusters in spring followed by blue-black drupes in fall. It's prized for its ornamental value, wildlife benefits, and adaptability to various soil conditions.

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Example Rusty Blackhaw Viburnum timeline · Pittsburgh, PA (Zone 6b)

Plant Rusty Blackhaw Viburnum
Around Apr 17

Near Pittsburgh's average last spring frost.
Tend & protect
Late spring–summer

Watering, feeding, and pest-watch reminders.
Harvest Rusty Blackhaw Viburnum
Late summer into fall

Before the first fall frost (≈ Nov 8)

Sample dates for Pittsburgh, PA. Sign up to get exact Rusty Blackhaw Viburnum dates for your own zip code.

Growing Conditions

☀️

Sun: Full sun to partial shade, 4-6 hours of direct sunlight preferred for best flowering

💧

Water: Moderate watering; establish deep root system through regular watering first 1-2 years; drought tolerant once established

📏

Spacing: 48 inches

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Days to maturity: Not applicable for ornamental shrub; reaches ornamental maturity in 3-5 years

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Planting depth: Plant at same depth as root ball; do not bury stem

Soil

Type: Well-draining loamy soil; highly adaptable to various soil types including clay and sandy soils

pH: 5.5-7.5

Amendments:

Compost or aged bark mulch at planting Organic matter to improve poor soils

Growing Zones

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Thrives in zones 5-9, with best performance in zones 6-8

5a 5b 6a 6b 7a 7b 8a 8b 9a

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Growth Stages

Establishment

First year

Young shrub focuses on root development; minimal above-ground growth

Water consistently 2-3 times weekly; protect from harsh sun and wind; avoid fertilizing first year

Vegetative Growth

Years 2-3

Develops branching structure and foliage; rusty-pubescent new growth is distinctive

Light pruning to shape; maintain consistent moisture; apply 2-3 inch mulch layer

Flowering

2-3 weeks in spring

Produces fragrant white to cream-colored flower clusters (cymes) in spring, typically April-May

Minimize pruning during flowering; ensure adequate moisture; observe for insect pollinators

Fruiting

Summer through winter

Flowers develop into small blue-black drupes that ripen in fall, persisting into winter

Do not prune heavily to ensure fruit set; allow birds and wildlife to feed; can appear red before turning fully blue-black

Dormancy

Winter months

Semi-evergreen or deciduous depending on climate; foliage may turn reddish in fall

Minimal watering in dormant period; light winter pruning acceptable; avoid heavy pruning

Companion Planting

Plan your garden →

Plant with:

Eastern Red Cedar Serviceberry (Amelanchier) Flowering Dogwood Redbud Winterberry Holly Fothergilla Native understory ferns

Avoid planting near:

Plants requiring consistently wet soil (viburnum prefers well-draining) Salt-sensitive plants if used in coastal areas

Common Pests

Prune and destroy infested branches; apply horticultural oil in early spring before bud break; neem oil spray for severe infestations
Hand-pick beetles; use Japanese beetle traps at distance from shrub; neem oil or spinosad spray if population is high
Increase humidity through misting; strong water spray to dislodge; miticide spray if severe
Insecticidal soap spray; strong water spray; encourage natural predators like ladybugs

Uses

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Wildlife Food Source

Wildlife

The blue-black drupes are consumed by numerous bird species (cedar waxwings, robins, mockingbirds) and mammals, making it an excellent native plant for wildlife habitat and food provision. [source]

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Traditional Herbal Use

Culinary

The bark and root bark have a long history of use in traditional Appalachian medicine as a tonic and astringent, though modern medicinal use is limited. [source]

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Ornamental Landscaping

Household

Valued as a specimen shrub, hedge plant, or part of native plant landscapes; attractive spring flowers, summer berries, and potential fall color make it year-round ornamental. [source]

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Landscape Design

Craft

Excellent for naturalized settings, woodland edges, rain gardens, and pollinator gardens; works well in mixed shrub borders and native plant communities. [source]

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Pollinator Support

Wildlife

Fragrant spring flowers attract bees, butterflies, and other pollinating insects, supporting broader ecosystem health. [source]

Harvest Tips

Not harvested in traditional sense; allow fruits to ripen fully (blue-black color) in fall for wildlife and ornamental appeal. Cuttings can be taken in summer for propagation (semi-hardwood) or in late fall/winter (hardwood). No fruit harvesting recommended for human consumption.

Fun Facts

🌱 The common name 'Blackhaw' comes from the dark fruit; 'Rusty' refers to the distinctive rust-colored or reddish pubescence (fine hairs) on new growth and stems
🌱 Viburnum rufidulum is a native species to the southeastern United States, naturally occurring in dry upland forests and woodlands from Pennsylvania south to Florida
🌱 The fruits can persist on branches well into winter, providing critical food for migratory birds when other food sources are scarce

Gardening Terms

New to gardening? Learn about terms used in this guide:

Full Sun Mulch Partial Shade

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