Skip to content

Plant Finder


Ironclad Viburnum*

Viburnum sieboldii 'KLMfour'

Add To My Wish List

print page
Ironclad Viburnum (Viburnum sieboldii 'KLMfour') at Wasco Nursery

Ironclad Viburnum flowers

Ironclad Viburnum flowers

(Photo courtesy of NetPS Plant Finder)

Ironclad Viburnum (Viburnum sieboldii 'KLMfour') at Wasco Nursery

Ironclad Viburnum

Ironclad Viburnum

(Photo courtesy of NetPS Plant Finder)

* This is a "special order" plant - contact store for details

Height:  15 feet

Spread:  12 feet

Sunlight:  full sun  partial shade 

Hardiness Zone:  4

Other Names:  Siebold Viburnum


A large, coarsely-textured ornamental shrub covered in creamy white flower clusters in spring followed by very showy bright pink-red fruits that slowly fade through dark red to black, leaving behind colorful flower stems for a long performance

Ornamental Features

Ironclad Viburnum is covered in stunning creamy white flat-top flowers at the ends of the branches in mid spring. The red fruits are held in abundance in spectacular clusters from mid summer to mid fall. It has dark green foliage throughout the season. The textured oval leaves do not develop any appreciable fall color.

Landscape Attributes

Ironclad Viburnum is an open multi-stemmed deciduous shrub with an upright spreading habit of growth. Its strikingly bold and coarse texture can be very effective in a balanced landscape composition.

This is a relatively low maintenance shrub, and should only be pruned after flowering to avoid removing any of the current season's flowers. It is a good choice for attracting birds to your yard, but is not particularly attractive to deer who tend to leave it alone in favor of tastier treats. It has no significant negative characteristics.

Ironclad Viburnum is recommended for the following landscape applications;

  • Accent
  • Mass Planting
  • Hedges/Screening
  • General Garden Use

Planting & Growing

Ironclad Viburnum will grow to be about 15 feet tall at maturity, with a spread of 12 feet. It tends to be a little leggy, with a typical clearance of 1 foot from the ground, and is suitable for planting under power lines. It grows at a medium rate, and under ideal conditions can be expected to live for 40 years or more.

This shrub does best in full sun to partial shade. It prefers to grow in average to moist conditions, and shouldn't be allowed to dry out. It is not particular as to soil type or pH. It is somewhat tolerant of urban pollution. This is a selected variety of a species not originally from North America.


* This is a "special order" plant - contact store for details

Hardiness Zone Plant Height Minimum Sunlight
Accent  Massing  Screening  Garden 
Flowers  Fruit  Texture  Attracts Wildlife 
Ornamental Features