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'Double Knock Out ®' rose Description
'Double Knock Out ®' rose photo
Photo courtesy of Woodbury, Celeste
Availability:
Commercially available
Synonyms:
RADtko
HMF Ratings:
32 favorite votes.  
Average rating: GOOD+.  
ARS:
Medium red Shrub.
Registration name: RADtko
Exhibition name: Double Knock Out ®
Origin:
Bred by William J. Radler (United States, 2004).
Introduced in United States by Conard-Pyle (Star Roses) in 2004.
Class:
Shrub.  
Bloom:
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.  
Habit:
Medium, bushy.  Small, semi-glossy, medium green foliage.  
Height of 3' to 4' (90 to 120 cm).  
Growing:
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.  
Patents:
United States - Patent No: PP 16,202   VIEW USPTO PATENT
Application  on  23 Jun 2004
Ploidy:
Triploid
Notes:
Additional info http://www.theknockoutrose.com/moreroses.cfm

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.