Shrub · Adoxaceae
Viburnum
Viburnum
Offer it sun, space, and steady water while it settles, and viburnum rewards you with 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 forgiving deciduous shrub that gives back for years, and it puts on two seasons of quiet show. Spring opens with clusters of white or pink flowers, many of them sweetly scented, and fall answers with bright berries and warm leaf color. The group is wonderfully varied, from low rounded mounds to shrubs that stretch toward the size of a small tree, so there is a friendly fit for almost any spot.
The best part for a nervous first-timer is how little viburnum asks of you. It weathers cold as low as -40°F (-40°C), settles happily into sun or part shade, and takes clay, loam, or sand in stride. Once its roots take hold, most kinds carry themselves through a dry stretch, so an occasional missed watering is easy to recover from.
Those fall berries do real work in the garden, too. Songbirds clear them through autumn and the thick branching offers shelter for nesting, so a viburnum hedge welcomes wildlife while it softens a fence line. Tuck it where you will walk past in spring, and the fragrance greets you kindly every year.
Care
The short version: settle viburnum into full sun to part shade in average, well-drained soil, keep it gently watered while it finds its feet, and prune soon after the spring flowers fade.
Light
Viburnum is happiest in full sun, where it blooms hardest and fruits most generously, though it will also settle for partial sun or partial shade. Push it into deep shade, though, and you gently trade away both the flowers and the fall berries.
Water
Offer it evenly moist, well-drained soil, especially in that first season while it settles in. Water deeply through the early months and during dry spells, every 5 to 10 days as the weather asks. Once the roots are comfortable, most viburnums shrug off drought on their own, so there is no need to fuss.
Soil
Average, medium-moisture loam suits viburnum nicely, and it takes clay or sand without complaint. Aim for a slightly acidic to neutral pH of 5.5 to 7.0, and give the water somewhere to drain so it never pools around the roots.
Temperature
This is a wonderfully cold-hardy shrub that shrugs off winters as low as -40°F (-40°C) and summer heat up to 95°F (35°C). That generous range covers most temperate gardens, so you will rarely need to shield it from the cold.
Humidity
Ordinary outdoor air is plenty for viburnum, so there is no humidity number to chase. What helps more is good airflow, since crowded, damp leaves can invite powdery mildew and leaf spot.
Feeding
Feed in early spring with a balanced slow-release or general shrub fertilizer, and keep a light hand. A viburnum growing in decent soil often needs little to no feeding at all, so there is no reason to push it.
Pruning
Prune just after the flowers fade, since next year's buds form on old wood and a late trim quietly removes them. Take out any dead, damaged, or crossing stems and shape gently as you go. An old, overgrown plant is forgiving enough to accept a hard rejuvenation cut, too.
Repotting
Viburnum is a landscape shrub that rarely needs repotting. If you are keeping one in a container for now, only pot it up when you notice roots circling the pot, poking through the drainage holes, or water running straight through.
Size & spacing
A mature shrub settles anywhere from 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 kind you choose. Give each plant room to reach its full width so air can move freely and disease stays away.
When to plant
Because viburnum forms its flower buds on old wood, the timing that matters most is when you prune, not when you plant. Set young shrubs out in the mild weather of spring or fall, savor the bloom from March into May, and enjoy watching 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 worries turn up on the leaves, whether a beetle has been chewing or a fungus or bacteria has left its mark. The good news is that an early catch usually lets the shrub bounce back with little fuss. Find the picture that matches yours below, then step in before it spreads.
Leaves eaten down to the veins in spring
Those stripped leaves are the work of the viburnum leaf beetle, whose larvae and then adults graze the foliage until only the veins are left. Three hard years in a row can be enough to lose a shrub, so it helps to act early rather than wait. Over winter, snip out and burn the twigs where the eggs were laid, then treat 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
Angular dark spots on the leaves with a little dieback
Sharp-edged dark blotches that spread through cool, wet spring weather usually mean bacterial leaf spot, and a stressed shrub can also drop a few shoots to a crown borer. Those angular edges are the clue that sets it apart from the rounder marks a fungus leaves. Gather and destroy the spotted leaves, prune out the worst shoots, and keep water off the foliage so the leaves dry quickly.
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 white powdery film over the upper leaves
That dusty gray coating is powdery mildew, a fungus that favors crowded, shaded shrubs when the days stay warm and the nights turn cool. It looks worse than it truly is and seldom causes lasting harm. Open the plant up with a little selective pruning to let in more sun, and reach for a labeled fungicide only if it keeps spreading. Leave the sulfur on the shelf, since it can injure 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 one of the gentler shrubs to live alongside a busy household. The ASPCA lists it as non-toxic to cats, dogs, and horses, and its berries feed the birds rather than harm them. Should a curious pet bolt a mouthful of leaves, you might see a brief upset stomach, but there is nothing truly poisonous to fear.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Viburnum is safe for cats. A cat that nibbles a good deal of leaves might drool or bring it back up, but that is simply the usual reaction to greenery, not poisoning.
Dogs None
Dogs can share a garden with viburnum without any worry. Wolfing down a pile of foliage or berries may unsettle the stomach for a short while, yet there is no real toxin at play.
Horses None
The shrub is non-toxic to horses, so a curious nibble along the hedge does them no harm at all.
Rabbits Safe
Rabbits can graze viburnum safely. The leaves and twigs hold nothing harmful, though a steady diet of any single plant is never the best idea.
Livestock Safe
Cattle, goats, and sheep can browse the foliage without trouble, since none of it is poisonous to grazing animals.
Birds Safe
Birds gather at the ripe berries and eat them happily. That fruit feeds songbirds right through fall and is one of the shrub's real gifts to the garden.
People Safe
Viburnum is not dangerous to people. Eating a lot of raw fruit from some species can leave you with 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 holds hundreds of species and cultivars, many more than one garden could ever need. A handful stand out for fragrance, fruit, or sheer toughness, and those are the ones worth getting to know by name.
Viburnum carlesii (Koreanspice viburnum)
A slow-growing shrub of 4 to 6 foot that opens pink buds into fragrant white snowball clusters in early spring, later trading them for blue-black berries in fall.
Viburnum dentatum (Arrowwood)
A tough native of 5 to 10 feet carrying flat creamy-white flower heads, blue-black drupes the birds adore, and dependable deer resistance.
Viburnum lentago (Nannyberry / Black Haw)
A tall native viburnum that the ASPCA confirms is non-toxic to cats, dogs, and horses.
Viburnum opulus (European cranberrybush)
A non-native with showy red fruit that has turned invasive across parts of the US, unlike the well-mannered native viburnums.
How to propagate
There are three kind ways to make more viburnum, from quick softwood cuttings to the slow patience of seed, and each fits a different goal and comfort level.
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 reliable way to copy a named cultivar true to its parent. Take them in late spring to early summer while the new 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, though it does test your patience. Sow fresh seed outdoors in fall, and a double dormancy can hold it back for 1 to 2 years before it sprouts, often slow and uneven. Seed saved from a cultivar will not come true to the parent.
LayeringEasy
Spring to summer · Several months to a year to root
Layering is the easy path when a shrub carries low, flexible branches. Pin one down into the soil in spring or summer, leave it joined to the parent while it roots over several months to a year, then cut it free to grow as its own plant.
Myths
A single viburnum will set a heavy crop of berries all on its own.
Most viburnums fruit well only when a second, genetically different cultivar of the same species grows nearby to pollinate them. Plant just one shrub and you will often get few berries, or none at all.
Viburnum berries are dangerously poisonous.
The ASPCA lists viburnum as non-toxic to cats, dogs, and horses, so there is little to fear. Eating a good deal of the raw fruit of some species may leave a person with a mild stomach upset, yet the plant is not considered seriously toxic.