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Knock Out Rose

Rosa 'Knock Out'

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Knock Out Rose (Rosa 'Knock Out') at Ashcombe Farm & Greenhouses

Rosa 'Knock Out' flowers

Rosa 'Knock Out' flowers

(Photo courtesy of NetPS Plant Finder)

Knock Out Rose (Rosa 'Knock Out') at Ashcombe Farm & Greenhouses

Rosa 'Knock Out' in bloom

Rosa 'Knock Out' in bloom

(Photo courtesy of NetPS Plant Finder)

Height:  3 feet

Spread:  3 feet

Sunlight:  full sun 

Hardiness Zone:  4b

Other Names:  Knockout Rose

Group/Class:  Shrub Rose

Description:

One of the most popular roses in the world today, primarily due to its low maintenance, superior disease resistance and incredibly long period of bloom, with seemingly endless cherry red flowers; all roses need full sun and well-drained soil

Ornamental Features

Knock Out Rose is smothered in stunning lightly-scented cherry red flowers at the ends of the branches from late spring to early fall, which emerge from distinctive ruby-red flower buds. The flowers are excellent for cutting. It has attractive dark green foliage which emerges burgundy in spring. The glossy oval compound leaves are highly ornamental and turn an outstanding burgundy in the fall. The fruit is not ornamentally significant.

Landscape Attributes

Knock Out Rose is a multi-stemmed deciduous shrub with a more or less rounded form. Its average texture blends into the landscape, but can be balanced by one or two finer or coarser trees or shrubs for an effective composition.

This shrub will require occasional maintenance and upkeep, and is best pruned in late winter once the threat of extreme cold has passed. Gardeners should be aware of the following characteristic(s) that may warrant special consideration;

  • Spiny

Knock Out Rose is recommended for the following landscape applications;

  • Mass Planting
  • Hedges/Screening
  • General Garden Use

Planting & Growing

Knock Out Rose will grow to be about 3 feet tall at maturity, with a spread of 3 feet. It tends to fill out right to the ground and therefore doesn't necessarily require facer plants in front. It grows at a fast rate, and under ideal conditions can be expected to live for approximately 20 years.

This shrub should only be grown in full sunlight. It does best in average to evenly moist conditions, but will not tolerate standing water. It is not particular as to soil type or pH. It is somewhat tolerant of urban pollution. This particular variety is an interspecific hybrid.

 
 
Hardiness Zone Plant Height Minimum Sunlight
Characteristics
Massing  Screening  Garden 
Applications
Flowers  Foliage Color  Fall Color  Bark 
Ornamental Features