Overview
Uses: Borders, foundation plantings, mass plantings, low hedges, containers.
Benefits: Rich cherry-red double blooms with a long season of color and a naturally tidy habit. Bred for strong disease resistance and reliable repeat bloom with simple, low-maintenance care.
USDA Hardiness Zones: 5–11
Sun: Full Sun
Life Cycle: Deciduous Shrub
Growth Habit: Mounding, Rounded — dense branching with a full canopy.
Bloom Color: Red
Mature Height: 3–4 feet
Mature Width: 3–4 feet
Bloom Season: Late Spring to Frost
Growth Rate: Moderate
Summary
Double Knock Out® delivers classic rose richness with a cleaner, easier routine.
From late spring through the first hard frost, this shrub rose produces deep red, double-petaled blooms that keep coming in steady waves. The plant maintains a full, mounded shape that looks polished in borders and foundation beds, and it’s equally effective when planted in repeating groups for bold color impact.
With a reputation for strong garden performance, Double Knock Out® is a dependable choice for growers who want long-lasting blooms and a neat landscape presence without constant upkeep.
Care
Double Knock Out® Rose Care
Plant in full sun for the best bloom production and overall vigor. Aim for at least 6 hours of direct sunlight daily.
Choose well-drained soil and avoid sites that stay soggy. If your soil is heavy, amend planting areas to improve drainage.
Water regularly during establishment. Once established, water deeply during extended dry periods, especially during summer heat.
In early spring, apply a balanced slow release fertilizer to support strong growth and repeat flowering.
Prune in late winter or early spring before new growth begins. A light shaping prune helps maintain size and encourages fresh flowering growth.
Size
What Size is the Double Knock Out® Rose for Sale Online?
Plants ship in a greenhouse-grade grow pot and are actively growing at the time of shipment. Size will vary slightly depending on the season and current growth stage. If you have specific sizing questions, please contact us.
How Large Does Double Knock Out® Rose Grow?
At maturity, Double Knock Out® typically reaches about 3–4 feet tall and 3–4 feet wide, forming a dense, rounded shrub that fills in beautifully over time.
Additional Information
What is the botanical name of Double Knock Out® Rose?
The botanical name is Rosa ‘Radrazz’.
What are some common names for this plant?
This plant is commonly called a shrub rose.
Does Double Knock Out® need deadheading to keep blooming?
Double Knock Out® is known for repeat flowering without the need for frequent deadheading. Removing spent blooms can keep the plant looking extra tidy, but it isn’t required for continued bloom.
Where does Double Knock Out® perform best in the landscape?
It performs best in sunny beds with good airflow and well-drained soil. For similar options, browse our Roses collection or explore easy-care landscape staples in Shrubs & Bushes.
