PopularRed Double Knock Out Rose
Rosa ‘Radtko’Local DFW Delivery Only
Product Details
Red Double Knock Out Rose
Rosa ‘Radtko’Red Double Knock Out Rose is a standout shrub that delivers season-long color from spring to fall. With its rounded, mounded growth habit and clusters of deep red, double blooms, it creates a dramatic yet classic look in any landscape. The rich green foliage provides a perfect backdrop, enhancing the intensity of the blooms. Ideal for borders, containers, and flower beds, this rose easily fits into both traditional and modern landscapes. At maturity, it reaches up to 3 feet tall and 3 feet wide, offering a balanced, full appearance that suits beds of any size.
- A deciduous shrub
- Rounded, mounded growth habit
- Moderate growth rate
- Deep red flowers blooming from spring to fall
- Perfect for borders, containers, and flower beds
Hardy in zones 5-11, Red Double Knock Out Rose is well-suited to the North Texas climate. Plant it in full sun, making sure it receives at least 6 hours of direct sunlight daily. Use well-drained soil to promote healthy growth and enjoy its rich, reliable blooms season after season.
Maintenance
The Red Double Knock Out Rose is one of the most reliable and low-maintenance flowering shrubs available. With minimal care, it delivers vibrant color from spring through frost, making it a staple in many landscapes:
- Watering: Water deeply once or twice a week during the first growing season to establish a strong root system. Once established, it tolerates moderate drought, but consistent moisture encourages abundant flowering. Avoid overhead watering to reduce the risk of leaf diseases, and water early in the day so foliage can dry before nightfall.
- Pruning: Prune lightly in early spring, just as new growth emerges. Remove any dead or damaged canes and shape the plant to maintain a rounded form. A light midseason trim after the first flush of blooms can encourage additional flowering. Avoid heavy pruning into old wood, as new growth primarily emerges from younger stems.
- Fertilizing: Apply a balanced rose fertilizer in early spring when new growth appears, and repeat lightly every 6–8 weeks through midsummer. Avoid over-fertilizing late in the season, as it can encourage tender growth susceptible to frost. Compost or organic mulch can also help enrich the soil naturally.
- Mulching: A 2-3 inch layer of mulch around the base conserves moisture, regulates soil temperature, and suppresses weeds. Keep mulch a few inches from the stems to prevent rot and pest issues.
- Winter Care: In colder climates, add extra mulch around the base in late fall for insulation. While hardy, protecting the roots helps ensure vigorous regrowth in spring. Avoid pruning late in the season to reduce winter dieback.
Common Issues and How to Take Care of Them
- Black Spot: Though Knock Out Roses are highly disease-resistant, black spot can occur in humid conditions. Remove affected leaves and ensure good airflow around the plant. Water at the base and apply fungicide if the problem persists.
- Aphids: These small pests can appear on tender new growth. Spray with water or use insecticidal soap to keep infestations under control. Beneficial insects like ladybugs also help naturally manage aphids.
- Powdery Mildew: Appears as a white coating on leaves in humid, still conditions. Improve airflow and water at the base to minimize risk.
- Root Rot: Caused by poor drainage or overwatering. Ensure well-draining soil and avoid standing water around the roots.
With simple care, mainly watering, light pruning, and occasional feeding, Red Double Knock Out Roses provide unmatched color, fragrance, and reliability from early spring to late fall.
It grows at a moderate rate, typically reaching 3-4 feet tall and wide within a few seasons.
Spring or early fall is ideal, giving the roots time to establish before temperature extremes.
Water deeply once or twice per week during dry periods, especially in the first year. Once established, it becomes more drought-tolerant, though regular moisture promotes consistent flowering and lush foliage.
Yes, once established, it tolerates short dry spells quite well. However, consistent watering during prolonged heat keeps blooms vibrant and foliage healthy.
Absolutely. Red Double Knock Out Roses thrive in large pots with well-draining soil. Ensure containers receive at least six hours of sunlight per day and water more frequently than in-ground plants.
Yes, one of its standout features is nearly nonstop blooming from late spring until frost. Deadheading is optional, as it naturally cleans itself, but removing spent blooms can encourage even heavier flowering.
While not completely deer-proof, the Red Double Knock Out Rose is less appealing to deer due to its thorns and slightly aromatic foliage. Deer browsing is usually minimal compared to other rose varieties.
With proper care, it can live 15-20 years or more. Annual pruning, disease monitoring, and periodic soil enrichment help maintain long-term vigor and flowering performance.
Yes, this rose adapts well to city and suburban environments, tolerating pollution, reflected heat, and even mild salt exposure. It’s a great option for street plantings, patios, and mixed borders.
Yes, its bright red blooms attract bees, butterflies, and other beneficial pollinators, supporting a healthy and vibrant garden ecosystem throughout the growing season.
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Red Double Knock Out Rose This plant | ||
|---|---|---|
| Scientific Name | Rosa ‘Radtko’ | Rosa ‘Meigalpio’ |
| Size at Maturity | 3' H x 3' W | 1' H x 2' W |
| Leaf Retention | Deciduous | Deciduous |
| Flower Color | Red | Red |
| Bloom Times | Spring, Summer & Fall | Spring, Summer & Fall |
| Sizes Available | 3 Gal | 3 Gal |
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