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'Double Knock Out ®' rose Description
'Double Knock Out ®' rose photo
Photo courtesy of jeffcat
Commercially available
HMF Ratings:
39 favorite votes.  
Average rating: GOOD+.  
Medium red Shrub.
Registration name: RADtko
Exhibition name: Double Knock Out ®
Bred by William J. Radler (United States, before 1999).
Introduced in United States by Conard-Pyle (Star Roses) in 2004.
Introduced in Australia by Corporate Roses Pty. Ltd. in 2011 as 'Double Knock Out'.
Red.  None to mild, cinnamon fragrance.  15 to 18 petals.  Average diameter 3".  Medium, semi-double to double, in small clusters bloom form.  Blooms in flushes throughout the season.  
Medium, bushy.  Small, semi-glossy, medium green foliage.  

Height: 3' to 4' (90 to 120cm).  
USDA zone 4a through 9b.  Can be used for beds and borders, garden or landscape.  Disease susceptibility: very blackspot resistant..  Remove spent blooms to encourage re-bloom.  Spring Pruning: Remove old canes and dead or diseased wood and cut back canes that cross. In warmer climates, cut back the remaining canes by about one-third. In colder areas, you'll probably find you'll have to prune a little more than that.  
United States - Patent No: PP 16,202  on  10 Jan 2006   VIEW USPTO PATENT
Application No: 10/873,196  on  23 Jun 2004
The female parent (i.e., the seed parent) was a seedling of the ‘Bucbi’ variety (U.S. Plant Pat. No. 4,225). The ‘Bucbi’ variety is marketed under the CAREFREE BEAUTY trademark. 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 rose plants of the new variety illustrated herein were approximately five years of age and were observed during mid-May, 2004, while growing outdoors near West Grove, Pa., U.S.A.
Additional info: The Knockout Rose

Parentage as per breeder's description of 'Knock Out' which according to the patent has the same parentage. Seedling numbers in post by Will Radler on May 29, 2017 re Cancan: Seedling 93-104.3 described as sister seedling of 'Double Knock Out', i.e. 85-139.1 x 84.196.8.

Ploidy supplied by David Zlesak.