Double Knock Out Rose
Rosa ‘Radtko’ · a red reblooming shrub rose
A Knock Out rose with full, double, cherry-red flowers that look like a classic rose and carry a sweet, fruity scent, blooming in waves from late spring to frost. It resists black spot, takes heat and humidity, and makes a bright hedge or specimen with little care. Deer and rabbits eat it.
- Mature size
- 3.5 × 3.5 ft
- 1.1 × 1.1 m, tall × wide
- Hardiness
- Zones 5a–10b
- USDA
- Sun
- Full sun
- Water
- Medium
- Blooms
- May–Oct
Double Knock Out Rose at its mature size
A mature Double Knock Out Rose grows 3 to 4 feet tall and just as wide.
Drawn to scale beside a 5 ft 9 in person. With VeraScape, you see it at this size in your own yard.
Typical mature size, unpruned. Sources: The Tree Center, NC State Extension.
Through the year
What Double Knock Out Rose looks like month by month in a typical zone 6–7 garden.
Dormant · Nov–Apr
Bare thorny canes, cut back in late winter.
In leaf · May–Oct
Covered in cherry-red double flowers.
Growing Double Knock Out Rose
- Grows well in
- The Northeast, the Southeast, the Midwest, the Plains and Mountain West, the desert Southwest, the Pacific Northwest, and California.
- Growth rate
- Medium
- Good for
- Hedge, small space, foundation planting, specimen, and fragrant
- Leaves
- Drops its leaves in winter
- Native to
- Garden hybrid
Spacing for a hedge
VeraScape spaces plants so their grown canopies just touch. For Double Knock Out Rose, that’s about 3.5 ft apart, center to center.
Place a row in your own yard and VeraScape spaces them at their mature width, so you can see whether they’ll crowd the walk.
See Double Knock Out Rose in your yard before you dig
Visualize it at its true size, alongside the rest of your design.
Other roses
Double Knock Out Rose
Knockout RoseAll drawn to the same scale.