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'Knock Out ®' rose Description
'Knock Out ®' rose photo
Photo courtesy of Ronda's Carolina Garden
Availability:
Commercially available
Synonyms:
HMF Ratings:
86 favorite votes.  
Average rating: EXCELLENT-.  
ARS:
Red blend Shrub.
Origin:
Bred by William J. Radler (United States, 1988).
Introduced in United States by Conard-Pyle (Star Roses) in 2000.
Introduced in France by Selection Meilland in 2001 as 'Knock Out'.
Class:
Shrub.  Earth Kind ™.  
Bloom:
Bright, fluorescent cherry red.  Mild, spice, tea fragrance.  5 to 13 petals.  Average diameter 3.5".  Large, single to semi-double, cluster-flowered bloom form.  Continuous (perpetual) bloom throughout the season.  Decorative buds.  
Habit:
Armed with thorns / prickles, bushy, compact, rounded.  Glossy, dark green foliage.  
Height of 2' to 4' (60 to 120 cm).  Width of 3' to 4' (90 to 120 cm).
Growing:
USDA zone 4b through 9b.  Can be used for landscape.  Very hardy.  vigorous.  shade tolerant.  Disease susceptibility: very blackspot resistant., susceptible to Mildew.  Requires spring freeze protection (see glossary - Spring freeze protection) .  Can be grown in the ground or in a container (container requires winter protection).  
Patents:
Australia - Application No: 2003/061  on  2003   VIEW PBR PATENT
 
United States - Patent No: PP 11,836  on  10 Apr 2001   VIEW USPTO PATENT
Application No: US1999000229323  on  13 Jan 1999
Shrub rose plant named `Radrazz'.
William J. Radler, Greenfield, Wisconsin
... a landscape shrub rose... single blossoms that are red... Excellent disease resistance to blackspot is exhibited...
The female parent (i.e., the seed parent) was a seedling of the `Carefree Beauty` variety (U.S. Plant Pat. No. 4,225). The male parent (i.e., the pollen parent) of the new variety was a seedling of the `Razzle Dazzle` variety (U.S. Plant Pat. No. 3,995)... The blooming cycle is believed to be one of the longest observed to date for a rose plant...
Ploidy:
Triploid
Notes:
In his garden in Tyler, Texas, Mark Chamblee, of Chamblee's Rose Nursery, grows 'Belinda's Dream', 'Marie Daly', 'Marie Pavie', 'Livin' Easy', 'Easy Going', 'Knock Out ®', and 'Mermaid'. Mark likes these varieties because "they have great hardiness and disease resistance, they are low maintenance and are very free blooming."


Parentage is per the breeder.