Shrub · Adoxaceae
Viburnum
Viburnum
Give it sun, space, and steady water while young, and viburnum keeps delivering spring fragrance and fall berries for decades.
Full sun
Every 5–10 days
USDA 2–8
4–12 ft · 1.2–3.7 m
Overview
Viburnum is a deciduous shrub that keeps on giving, packing two full seasons of payoff into one plant. Spring bursts open with clusters of white or pink flowers, plenty of them wonderfully fragrant, then fall rolls in with bright berries and blazing leaf color. Pick your scale, too: the genus runs from low rounded mounds all the way up to shrubs that push toward the size of a small tree.
Best of all, it grows almost anywhere you put it. It powers through cold to -40°F (-40°C), thrives in sun or part shade, and roots happily into clay, loam, or sand. Get it established and most kinds coast through a dry spell on their own, so you spend more time enjoying it than fussing over it.
Those berries turn a garden into a busy place. Songbirds work them over through fall, and the dense branching invites nesting, so a viburnum hedge pulls in wildlife while it screens a fence line. Plant it where you brush past in spring and grab a hit of fragrance every year.
Care
The short version: plant viburnum in full sun to part shade in average, well-drained soil, keep the water coming while it settles in, and prune right after the spring flowers fade.
Light
Plant viburnum in full sun and it flowers hardest and fruits heaviest, though it still takes partial sun or partial shade in a pinch. Bury it in deep shade, though, and you kiss goodbye to both the bloom and the fall berries.
Water
Keep the soil evenly moist and well-drained, especially while the shrub is settling in. Water deeply through that first season and any dry spell, every 5 to 10 days as the weather dictates. Once the roots dig in, most viburnums shrug off drought and carry themselves.
Soil
Average, medium-moisture loam is the sweet spot, and clay or sand work fine too. Dial in a slightly acidic to neutral pH of 5.5 to 7.0, and give the water a way to drain so it never sits around the roots.
Temperature
This shrub is genuinely tough, powering through winters down to -40°F (-40°C) and summer heat up to 95°F (35°C). That span covers most temperate gardens, so winter protection is rarely on the to-do list.
Humidity
Everyday outdoor air suits it fine, so skip chasing a humidity number. Put your energy into airflow instead, since crowded, damp leaves roll out the welcome mat for powdery mildew and leaf spot.
Feeding
Feed in early spring with a balanced slow-release or general shrub fertilizer, and keep it light. A viburnum in decent soil often needs little to no feeding at all, so there is no need to push it.
Pruning
Prune the moment the flowers fade, because next year's buds sit on old wood and a late cut wipes them out. Clear out dead, damaged, or crossing stems and shape as you go. Got an old, overgrown one? It will take a hard rejuvenation cut and come roaring back.
Repotting
Viburnum is a landscape shrub, so it rarely needs repotting. Holding one in a container for now? Bump it up only when roots circle the pot, poke out the drainage holes, or water runs straight through.
Size & spacing
Count on a mature shrub hitting 4 to 12 feet (1.2 to 3.7 m) tall with a 4 to 10 foot (1.2 to 3 m) spread, depending on the pick. Give each plant room for its full width so air moves freely and disease stays away.
When to plant
Viburnum builds its flower buds on old wood, so pruning drives the calendar far more than planting does. Get new shrubs in the ground during mild spring or fall weather, cheer on the bloom from March into May, and watch the berries color up from late summer into fall.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: Spring or fall
- Harvest: Spring (March to May); colorful berries ripen late summer into fall
Hardiness
USDA hardiness zones: 2–8
Temperature: down to -46°C
Troubleshooting
Most viburnum trouble lands right on the leaves, whether a beetle is chewing or a fungus or bacteria has moved in. Jump on it early and the shrub bounces back fast. Match your symptom below, then act before it spreads.
Spring foliage stripped to a skeleton of bare veins
Those shredded leaves point straight to the viburnum leaf beetle, whose larvae and adults strip foliage until only the veins hang on. Move quick, since three brutal years in a row can take the shrub down. Cut out and burn the egg-laid twigs over winter, then hit the young larvae soon after they hatch in spring.
Fix:
- Prune out and destroy egg-infested twigs between October and April before larvae hatch
- Treat newly hatched larvae in spring with a labeled insecticide applied shortly after emergence
- Alternatively apply a single labeled systemic soil drench in spring but no later than early July to control adults
Sharp-edged dark blotches on leaves plus shoots dying back
Sharp-edged dark blotches that spread through cool, wet spring weather flag bacterial leaf spot, and a stressed shrub can also drop shoots to a crown borer. Those angular edges are your tell, setting it apart from the rounder marks a fungus leaves. Strip off and destroy the spotted leaves, prune out the worst shoots, and keep water off the foliage so leaves dry fast.
Fix:
- Remove and destroy infected leaves and prune out badly affected shoots
- Avoid overhead watering and work plants only when dry
- Improve spacing and airflow to speed leaf drying
A pale dusty film creeping over the leaf tops
That gray film is powdery mildew, a fungus that pounces on crowded, shaded plants when the days run warm and the nights turn cool. It looks rough but rarely does real harm. Open the shrub up with selective pruning to pour in more sun, and grab a labeled fungicide only if it keeps marching. Skip sulfur, since it burns sulfur-sensitive viburnums.
Fix:
- Improve air circulation by proper spacing and selective pruning
- Reduce excessive shade
- Apply a labeled fungicide such as myclobutanil, propiconazole, or thiophanate-methyl if needed; use horticultural oil only when temperatures stay below 85 degrees F
- Do not use sulfur, which can injure sulfur-sensitive viburnums
Toxicity
Viburnum is a garden win for a busy household. The ASPCA lists it as non-toxic to cats, dogs, and horses, and the berries feed the birds instead of harming them. A pet that grabs a mouthful of leaves might get a quick upset stomach, but there is no real poison in play.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Viburnum is safe for cats. A cat that plows through a bunch of leaves might drool or bring it back up, but that is just the usual reaction to greenery, not poisoning.
Dogs None
Dogs can romp around viburnum with zero worry. Wolf down a pile of foliage or berries and a dog might get a short stomach upset, but no real toxin is behind it.
Horses None
The shrub is non-toxic to horses, so a curious browse along the hedge does no harm at all.
Rabbits Safe
Rabbits can graze viburnum safely, since the leaves and twigs carry nothing harmful, though loading up on any one plant is never a great plan.
Livestock Safe
Sheep, goats, and cattle can chow down on the foliage and stroll away just fine, since nothing in the plant poses a poisoning threat to grazing herds.
Birds Safe
Birds swarm the ripe berries and clean them off in no time. That fruit fuels songbirds right through fall and stands out as one of the shrub's best garden tricks.
People Safe
Viburnum is not dangerous to people. Eat a lot of raw fruit from some species and you might catch a mild stomach upset, but it is not seriously toxic.
Although not toxic, eating any plant material can cause mild, temporary stomach upset or vomiting in pets, and large quantities of raw fruit of some species may cause mild digestive upset in people.
Varieties
The genus stacks up hundreds of species and cultivars, far more than one garden could ever use. A few really shine for fragrance, fruit, or toughness, and those are the ones to chase down by name.
Viburnum carlesii (Koreanspice viburnum)
A slow grower at 4 to 6 foot that pops pink buds into fragrant white snowball clusters in early spring, then flips to blue-black berries by fall.
Viburnum dentatum (Arrowwood)
A tough native powering up to 5 to 10 feet, loaded with flat creamy-white flower heads, blue-black drupes the birds devour, and reliable deer resistance.
Viburnum lentago (Nannyberry / Black Haw)
A soaring native that comes with an ASPCA stamp of approval, verified non-toxic for horses, dogs, and cats.
Viburnum opulus (European cranberrybush)
A non-native flaunting showy red fruit that has turned invasive in parts of the US, unlike the well-behaved native viburnums.
How to propagate
Want more viburnum? Grab one of three methods, from fast softwood cuttings to slow seed, and pick the one that fits your goal and your patience.
Stem cuttingsModerate
Late spring to early summer while growth is soft (softwood) · Roots in about 3-4 weeks under mist; transplantable plants in about 3 months
Softwood cuttings are the surefire way to clone a named cultivar true to type. Snip them in late spring to early summer while the growth is still soft, dip the cut end in rooting hormone, and keep them warm and humid. They root in about 3 to 4 weeks under mist and are ready to move on in roughly 3 months.
SeedDemanding
Sow fresh seed in fall outdoors · Often 1-2 years to germinate due to double dormancy
You can raise the straight species from seed, but brace for a wait. Sow fresh seed outdoors in fall and a double dormancy can stall it for 1 to 2 years before it sprouts, often slow and erratic. Seed off a cultivar will not come true to the parent.
LayeringEasy
Spring to summer · Several months to a year to root
Layering is the easy win when a shrub carries low, flexible branches. Pin one down into the soil in spring or summer, leave it attached to the parent while it roots over several months to a year, then cut it free as its own plant.
Myths
A single viburnum will crank out a heavy berry crop all by itself.
Most viburnums only fruit well with a second, genetically different cultivar of the same species planted nearby to pollinate them. Plant just one and you usually end up with few berries, or none at all.
Those glossy viburnum berries carry a dangerous dose of poison.
Not so. The ASPCA lists viburnum as non-toxic to cats, dogs, and horses. Eat a lot of the raw fruit from some species and you might land a mild stomach upset, but the plant is not considered seriously toxic.