Knockout Rose
Rosa radrazz
The easy rose: bred to bloom in waves from spring to fall with little pruning and strong resistance to black spot, as a hedge, accent or mass planting. It takes heat and humidity and blooms reasonably even in part shade. Deadhead for faster rebloom and water in drought. Deer and rabbits eat it.
- Mature size
- 3.5 × 3.5 ft
- 1.1 × 1.1 m, tall × wide
- Hardiness
- Zones 5a–9b
- USDA
- Sun
- Full sun to part sun
- Water
- Medium to moist
- Blooms
- May–Oct
Knockout Rose at its mature size
A mature Knockout 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: NC State Extension.
Through the year
What Knockout Rose looks like month by month in a typical zone 6–7 garden.
Dormant · Dec–Mar
Bare thorny green-brown canes.
In leaf · Apr
Rounded bush of glossy dark green leaflets with burgundy new growth, no flowers.
In flower · May–Oct
Covered in cherry-red single to semi-double roses.
Fall · Nov
Few flowers, leaves turning yellow-bronze, some small orange hips.
Growing Knockout 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, and specimen
- Leaves
- Drops its leaves in winter
Spacing for a hedge
VeraScape spaces plants so their grown canopies just touch. For Knockout 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 Knockout Rose in your yard before you dig
Visualize it at its true size, alongside the rest of your design.
Other roses
Knockout Rose
Double Knock Out RoseAll drawn to the same scale.