The 'Double Knock Out®' Rose (Rosa 'Radtko') is a highly popular, low-maintenance shrub rose known for its continuous cherry-red, double blooms and exceptional disease resistance.
Flowers: Abundant clusters of cherry-red, fully double flowers (20-23 petals) that bloom continuously from late spring until the first frost. They have a mild, sweet, fruity scent.
Foliage: Glossy, dark green leaves that emerge with a reddish tint in spring and turn an attractive deep purple in the fall, providing multi-season interest.
Size: A compact, multi-stemmed shrub with a rounded habit, typically growing to about 3–4 feet tall and 3–4 feet wide at maturity.
Hardiness & Resistance: Highly disease-resistant to black spot, powdery mildew, and rust, making it an excellent choice for novice gardeners. It is cold hardy in USDA Zones 5–9 (or 5-11 in warmer climates) and heat tolerant.
Light: Performs best in full sun (at least 6-8 hours of direct sunlight daily) for optimal growth and flowering.
Soil: Adaptable to a range of soil types, but prefers moist, slightly acidic, well-drained soil.
Maintenance: Exceptionally low maintenance. It is self-cleaning, meaning no deadheading is required to encourage new blooms.
Pruning: Prune in early spring, just as new growth begins to emerge. Cut the plant back by about one-third to one-half to maintain a dense shape and encourage new growth.
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| SKU | Inventory |
| Item (88036) | 12 in stock. |