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Blackhaw Viburnum
A handsome, tough native large shrub or small tree with flat white spring flowers, edible raisin-like blue-black fall fruit, brilliant burgundy fall color, and a real place in traditional medicine as 'blackhaw' bark.
Safety notes The ripe blue-black fruits are edible and pleasant - sweet and raisin-like when fully soft, eaten fresh or cooked into preserves, around a single flat seed. Eat them only fully ripe (dark and soft); underripe fruit is astringent. The bark has a genuine historical use as a uterine tonic, but it also carries salicylates and oxalates - leave such preparations to qualified practitioners, and avoid them in pregnancy, in children, with an aspirin allergy, on blood thinners, or with kidney stones.
Overview
Blackhaw viburnum (Viburnum prunifolium) is one of the most useful and adaptable native viburnums - a rugged large shrub or small tree (often 12-20 feet) that earns its place several ways. In spring it is covered in flat-topped clusters of creamy-white flowers that feed pollinators; through summer its clusters of fruit ripen slowly; and in fall it delivers edible fruit and rich burgundy-red foliage at once, aging into handsome blocky 'alligator' bark on old trunks.
Quick facts
- Sprouts in
- 180 daysRange: 60–540 days
- Soil temperature
- 68 °FRange: 60–75 °F
- Height
- 18 ftRange: 12–30 ft
- Spread
- 12 ftRange: 8–18 ft
- Cold
- Takes hard frostdamaged below -30°F
- Heat
- Struggles above 95°F
- Life cycle
- Perennial, lives about 40 years
- Save seeds
- About 150 days after plantingRange: 120–180 days
- Self-sows
- Yes, expect volunteers
- Soil
- Well-drained
- Water
- Medium
- Plant spacing
- 10 ftRange: 6–15 ft
When to plant
Fall sowing is open for 19 more days. Next: spring, Mar 27 to May 22.
- Direct sow Oct 11 – Nov 8 Open now · 19 days leftAbout 2 weeks before to 2 weeks after your first frost (Oct 25 here)Fall-sow cleaned seed outdoors; viburnum seed has a complex double dormancy and can take up to two years to germinate, so cuttings or transplants are far faster.
- Transplant Mar 27 – May 22 Opens in 158 daysAbout 2 weeks before to 6 weeks after your last frost (Apr 10 here)Plant container blackhaw in early spring into well-drained soil in full sun to part shade; plant two or more for good fruit set. More sun means more flowers, fruit, and fall color.
- Transplant Aug 16 – Sep 27 Opens in 300 daysAbout 10 weeks before to 4 weeks before your first frost (Oct 25 here)Fall planting works well in cooler zones; keep watered until dormancy and mulch the roots.
Frost here: last around Apr 10 (Mar 27 to Apr 24 most years), first around Oct 25. Zone averages, your own yard may run a week or two either way.
Life stages
Establish, grow, repeat
Getting established and returning each season are different parts of the story.
Stage 1 of 5 · Getting established
Years 1-2 - young plant
The first year after planting
Care at this stage
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Water regularly while establishing
Keep a new blackhaw evenly watered through its first two years. It is adaptable and drought-tolerant once established but roots in better with steady moisture. Decide early whether to grow it as a multi-stem shrub or prune to a single-trunk small tree.
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Mulch and plant for cross-pollination
Mulch the root zone. Fruit set is much heavier with a second, genetically different blackhaw nearby for cross-pollination - a different seedling or a different cultivar of Viburnum prunifolium, not a clone of the same plant. Other viburnum species will not pollinate it, so a rusty blackhaw or nannyberry beside it is company, not a partner. A lone plant often sets little fruit even though it flowers well.
Months are typical seasonal windows; climate, variety, and plant age can shift them.
Harvest
- Fruit fully dusty blue-black, soft, and sweet in late summer to fall (not the astringent green or pink stage)
- Fruit yields easily and tastes raisin-like; foliage turning rich burgundy-red
- Pick fruit fully blue-black and soft · every 5 days
- Rich red-purple fall color
Per plant 1 to 20 lbPicking pick as they ripen
Cook with Blackhaw Viburnum
Watch out for
3 to know. None are high-risk for Blackhaw Viburnum. 2 are active in October.
Poor Fruit Set (No Cross-Pollination)Severity Medium DisordernowSeason: Sep–OctAbundant spring flowers but few fruits developing on a lone plant or a group of identical clones.
Abundant spring flowers but few fruits developing on a lone plant or a group of identical clones.
Add a second, different plant nearby; there is no other remedy for a lone plant's light fruit set.
Plant two or more genetically different blackhaws - separate seedlings or different cultivars of Viburnum prunifolium - within pollinating distance. A different viburnum species will not do it; pollen only crosses within the species.
Possumhaw viburnum sets its spectacular color-shifting fruit far more heavily with cross-pollination, so a single plant (or clones of one) flowers well but fruits sparsely - the usual reason for a disappointing berry display.
Bird Fruit LossSeverity Low WildlifenowSeason: Sep–NovRipening berries disappearing fast, birds swarming the tree as fruit colors, half-eaten berries and droppings.
Ripening berries disappearing fast, birds swarming the tree as fruit colors, half-eaten berries and droppings.
Net promptly; otherwise accept it as feeding wildlife - which is itself a valid and valuable use of the plant.
Drape bird netting over the tree as the berries begin to color, or plant enough to share; a single small unnetted tree rarely leaves fruit for people.
Birds do eat chokeberries, but because the fruit is astringent they usually take it later than sweeter berries, so competition for a human harvest is far milder than with serviceberry or blueberry.
Viburnum Leaf BeetleSeverity Low PestSeason: May–JulLacy, skeletonized new leaves in spring, ragged holes in summer, and rows of raised, dark egg-laying scars on the undersides of young twigs in fall and winter.
Lacy, skeletonized new leaves in spring, ragged holes in summer, and rows of raised, dark egg-laying scars on the undersides of young twigs in fall and winter.
Prune and destroy egg-laden twigs in the dormant season; treat larvae early in spring with insecticidal soap or a targeted insecticide if infestations are heavy, before adults emerge.
Scout twigs in fall/winter and prune out those bearing egg-laying scars before spring - the single most effective control; encourage predatory insects and choose more resistant viburnum species where beetle pressure is severe.
An introduced beetle (Pyrrhalta viburni) that is the most serious pest of viburnums: larvae skeletonize new leaves in spring and adults chew ragged holes in summer, and repeated heavy defoliation can weaken or kill a shrub over a few years. Native highbush cranberry is among the more susceptible viburnums.
Good & bad neighbors
Plant nearby
-
Underplanting blackhaw with evergreen christmas fern and other woodland natives completes a shaded understory layer beneath the small tree.
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Both native understory small trees for the woodland edge, combining dogwood's spring bracts and blackhaw's white flowers and fall fruit for a layered, part-shade, wildlife-friendly planting.
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Two native small trees with edible fruit and four-season interest - serviceberry's June berries and blackhaw's fall fruit and burgundy color layer a productive, bird-rich woodland edge.
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A shade-tolerant native pairing: spicebush's aromatic understory layer beneath blackhaw's canopy, both feeding pollinators and birds in a moist woodland-edge community.
Varieties · 4
You pick one when you add Blackhaw Viburnum to your garden. Its days to maturity set your harvest window.
Blackhaw (Viburnum prunifolium)
The wild species: a tough, adaptable native large shrub or small tree 12-20 feet tall with flat white spring flowers, edible raisin-like blue-black fall fruit, brilliant burgundy fall color, and blocky 'alligator' bark.
Variety details for Blackhaw (Viburnum prunifolium)
Multi-stem shrub or small tree with white flower clusters, blue-black fruit, and burgundy-red fall foliage over blocky bark.
speciesnativeedible-fruitfall-colorShade- and drought-tolerant, and historically the medicinal 'blackhaw' bark plant. Plant two for fruit.
Rusty Blackhaw (Viburnum rufidulum)
A closely related Southern native (V.
Variety details for Rusty Blackhaw (Viburnum rufidulum)
Small tree with very glossy leaves, white flower clusters, blue fruit, and vivid red fall color.
speciesnativesouthernglossy-leavesrufidulum) with glossy dark leaves, rusty-hairy buds, showy white flowers, edible blue-black fruit, and outstanding red-purple fall color. More heat-adapted and a superb small specimen tree for the Southeast. Note it is a different species, so it will NOT cross-pollinate blackhaw - grow it alongside for interest and wildlife, and pollinate blackhaw with a second V. prunifolium.
Nannyberry (Viburnum lentago)
A larger, more northern relative (V.
Variety details for Nannyberry (Viburnum lentago)
Tall shrub or small tree with white flower clusters and edible blue-black fruit on arching branches.
speciesnativeedible-fruitcold-hardylentago) with similar edible blue-black fruit, white spring flowers, and good fall color, very cold-hardy and vigorous. A fine choice in cooler zones - but it is a separate species, not a pollen partner for blackhaw; viburnums only cross within their own species, so pair each with a second, genetically different plant of its own kind.
Single-Trunk Tree Form
Blackhaw trained as a single-trunk small tree by removing suckers and lower limbs, showcasing its handsome blocky 'alligator' bark and layered branching as an elegant specimen.
Variety details for Single-Trunk Tree Form
Elegant single-trunk small tree with tiered branches, white flowers, blue fruit, and attractive blocky bark.
tree-formspecimenornamental-barktrainedA landscape approach rather than a distinct variety, ideal for a focal-point native small tree.
Grower tips
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