Blue Muffin arrowwood

Sun

Full sun to partial shade; flowering and berry production are strongest with at least six hours of direct sun.

Water

Moderate; keep evenly moist while establishing, then water during prolonged dry spells.

Soil

Moist, well-drained soil; tolerates clay and a broad pH range, but avoid persistently waterlogged ground.

Height

5-7 ft (1.5-2.1 m)

Spread

5-7 ft (1.5-2.1 m)

Flowers

Late spring to early summer; small white flowers in flat-topped clusters.

Foliage

Opposite, oval, dark green leaves with prominent veins and sharply toothed edges; autumn colour ranges from yellow to burgundy.

Growth

Moderate

Care needed

Low

• Pollinators
• Cold hardy
• Wildlife
• Low allergen

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Easy

Toughness

Fairly tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   1.6 ft (0.5 m)

2. After 1 year

   2.5 ft (0.76 m)

3. After 2 years

   3 ft (1 m)

4. After 3 years

   4 ft (1.3 m)

5. After 5 years

   6 ft (1.8 m)

   full size

About 5 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Safe

Native to

the US

In the garden

Spreads vigorously: plan to contain it.

Growth rate

Moderate

• Water deeply during the first two growing seasons whenever the root zone begins to dry.
• Apply a 2-3 in (5-8 cm) layer of organic mulch, keeping it clear of the stems.
• Feed only if growth is weak; apply a modest amount of balanced slow-release fertiliser in spring.
• Plant a different arrowwood selection with overlapping flowering nearby if you want berries.
• Allow room for its mature width rather than keeping it small by repeated shearing.
• The species range extends into USDA zone 2, but Blue Muffin is generally sold for zones 3-8; choose a sheltered site at its cold limit.

Pruning. Prune immediately after flowering, removing dead or crossing stems and, if needed, a few of the oldest stems at ground level. Keep trimming light because removing flowered shoots also removes developing berries; winter pruning removes the next flower crop.

Late winter

Inspect twigs for viburnum leaf beetle egg pits; prune out affected tips before eggs hatch.

Spring

Refresh mulch and water new plants during dry weather.

Late spring

Check that your pollen partner flowers at the same time, and watch new leaves for beetle larvae.

Early summer

After flowering, remove damaged or congested stems only where needed.

Summer

Water deeply during extended drought, especially while berries are developing.

Autumn

Plant container-grown shrubs while soil is workable and leave berries for birds.

• Plant as an informal hedge, including compatible arrowwood selections to improve fruiting.
• Use at a sunny woodland edge with ferns and shade-tolerant perennials.
• Place behind flowering perennials as a leafy summer backdrop with autumn colour.
• Include in a mixed wildlife border where flowers feed insects and berries attract birds.

Garden styles it suits: Wildlife garden, Woodland, Native hedgerow, Traditional, Autumn colour and Low-maintenance.

Plant it with: Wild bergamot, Purple coneflower, Black-eyed Susan, New England aster, Christmas fern and Oakleaf hydrangea.

Wildlife: Flowers provide pollen and nectar for visiting insects, and birds eat the blue berries. The dense branching offers shelter; arrowwood also supports native caterpillars within its eastern North American range.

• Viburnum leaf beetle can severely skeletonise leaves where established, including parts of North America and Britain. Remove egg-bearing twigs in winter and control young larvae promptly using locally approved methods.
• Few or no berries usually mean there is no compatible pollen partner, flowering times do not overlap, or pruning removed flowers. Add a genetically different arrowwood with matching bloom time and prune lightly.
• Powdery mildew may coat leaves in crowded or shaded conditions. Improve airflow, avoid drought stress and remove badly affected fallen foliage.
• Leaf spots can develop in damp weather. Water at soil level, clear fallen leaves and avoid crowding; minor spotting rarely needs treatment.

Not known to be toxic to cats, dogs or horses, and not generally considered poisonous to people. It is grown as an ornamental, not a food crop; eating substantial amounts of berries or other plant material may cause stomach upset.

• American cranberrybush (Viburnum opulus var. americanum)

  Has three-lobed, maple-like leaves and red fruit rather than unlobed, toothed leaves and blue fruit.

• Koreanspice viburnum (Viburnum carlesii)

  Has rounded clusters of strongly fragrant flowers opening from pink buds, rather than flat white flower clusters.

• Smooth witherod (Viburnum nudum)

  Has smoother, glossier leaves with mostly untoothed margins; its fruit often passes through pink before becoming blue-black.

Arrowwood refers to the traditional use of straight stems for arrow shafts, while dentatum means toothed, describing the leaf margins.

Propagation. Root softwood cuttings in late spring or early summer, or layer a low branch. Seedlings will not reliably retain the compact habit or other characteristics of 'Christom'.

Accepted botanical name

Viburnum dentatum

In the US and Canada

Native in the lower 48 states.

Native range

Connecticut, Delaware, District of Columbia, Illinois, Indiana, Iowa, Kentucky, Maine, Maryland, Missouri, New Jersey and Ohio.

Measured

Average height 460 cm.

Sources: GBIF (CC BY 4.0), USDA PLANTS and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.