Knockout (Rosa RADrazz 'Knockout')-Hort Answers - University of Illinois Extension
University of Illinois Extension

University of Illinois Extension

Hort Answers

Rose

Knockout
Rosa RADrazz 'Knockout'


 
Features
Shrub rose with dark glossy foliage tipped with burgundy. Flowers are red, single 3-inch wide (petal count 5-11) with a slight fragrance. Recurrent bloom through the season. 
 
Culture
Sun to light shade well-drained soil. Prune by the renewal method removing about one-third of the oldest canes to the soil line in the spring as needed to keep the shrub open and new canes in production. Head back as needed to maintain height and width. 
 
Cultivars

'Pink Knockout' 3 feet tall, single medium pink flowers

'Rainbow Knockout' 3 feet tall, single coral pink flowers

'Blushing Knockout' 3 feet tall, single, light pink flowers

'Double Knockout' 3 feet tall, double pink flowers

 
 
Mature Height
2-4 Feet (width 3 feet)
 
Size
Medium
 
 
USDA Hardiness Zone
4 - 9 
 
Bloom Color
Red
 
 
Bloom Season
July - October
 
Soil Conditions
Moist, Well-Drained
 
 
Exposure/Light Requirements
Full Sun
Partial Sun/Shade
 
 
Pests and Problems

Environmental Damage

Insect Damage


Additional pests and problems that may affect this plant:

Extreme disease resistance to black spot and mildew. Watch for Japanese beetle, aphids, cane borer and rose midge.
 
Additional Notes
Extremely hardy shrub rose with excellent disease resistance.  Tolerant of a little light shade.

 

 
Related Resources
Home, Yard & Garden Pest Guide
Illinois Commercial Landscape and Turfgrass Pest Management Handbook
U of IL - Distance Diagnosis through Digital Imaging
U of IL - Plant Clinic