Light Needs
Mature Height
Mature Spread
Growing Zones
Double Knock Out Red Rose (Rosa x 'Radtko' PP#16202) is a show-stopping, maintenance-free shrub rose that delivers color from spring until late fall. Its vivid red, double-petaled blooms are self-cleaning, meaning no deadheading is required to keep the flowers coming.
Highly resistant to black spot and downy mildew, this hardy rose is both beautiful and low-maintenance. Perfect as a hedge, mass planting, or standalone accent, the Double Knock Out Red Rose brings vibrant color and elegance to any garden.
Double Knock Out Red Rose Care
Plant in well-drained soil and provide fertilizer in early spring to encourage healthy growth and abundant blooms. Apply mulch in fall to insulate and protect the roots over winter. Prune in early spring to shape the plant and promote new growth.
Double Knock Out Red Rose Spacing
For a dense, formal hedge, plant 3–4 feet apart, center-to-center. For mass plantings or informal hedges, space at least 5 feet apart.
Why Grow Double Knock Out Red Rose?
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Vivid red, double blooms from spring through fall
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Self-cleaning flowers—no deadheading required
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Disease-resistant, including black spot and downy mildew
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Versatile use as hedge, mass planting, or accent
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Low-maintenance, reliable performer
The Double Knock Out Red Rose is an easy-care, long-blooming shrub rose that combines beauty, resilience, and nonstop color for three seasons of garden enjoyment.
Red Double Knock Out Rose Plant Facts
| USDA Hardiness Zones: 5-11 |
| Flower Color(s): Cherry Red |
| Bloom Period: Spring to First Frost |
| Foliage Color(s): Deep Purplish Green |
| Exposure: Full Sun |
| Height: 3-4 Feet |
| Spread: 3-4 Feet |
| Spacing: 3-4 Feet Center on Center |
| Habit: Bushy |
| Blooms On: New Wood |
| Watering: Drought Tolerant |
| Shrub Type: Deciduous |
| Scientific Name: Rosa x 'Radtko' |
| Common Name: Red Double Knock Out Rose |
| Brand: Knock Out Roses |
| Root Stock: Grafted For Consistent Performance |
| Root Stock: Own Root |
Please Note: The pictures below are to give a general representation of the different container sizes. The actual size/ages of plants are estimates and will vary based on type of plant, time of year, last pruning & many other factors.
Also Known As:
Quart
Plant Age:
~ 6 months - 1 year
Plant Size:
~ 4"-8"
Pot Size:
~ 4.75"H x 4.5"W
Volume:
1.50 quarts
Also Known As:
2.5 Quart Pot
Plant Age:
~ 1 - 2 years old
Plant Size:
~ 8"-12"
Pot Size:
~ 6.5"H x 6.5"W
Volume:
2.20-2.30 quarts
Also Known As:
#1 Container
1 Gallon
Plant Age:
~ 1 - 2 years old
Plant Size:
~ 10"-14"
Pot Size:
~ 7"H x 7.75"W
Volume:
2.26-3.73 quarts
Also Known As:
#2 Container
2 Gallon
Plant Age:
~ 1.5 - 3 years old
Plant Size:
~ 12"-18"
Pot Size:
~ 9.5"H x 9.5"W
Volume:
1.19-1.76 gallons
Also Known As:
#3 Container
3 Gallon
Plant Age:
~ 2 - 4 years old
Plant Size:
~ 12"-30"
Pot Size:
~9.5"H x 11"W
Volume:
2.32-2.76 gallons
Also Known As:
#5 Container
5 Gallon
Plant Age:
~3-4 years old
Plant Size:
~ 20" - 60"
Pot Size:
~11" H x 10 1/2” W
Volume:
3.5 - 4 gallons
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We want your plants to arrive in great condition! If you notice any issues upon delivery, contact us within 3 days.
Starting January 1, 2025 all bushes, perennials & trees purchased come with an extended 1-year warranty for added confidence. If your plant dies due to a health issue within a year, we’ll make it right.
Plants that are currently in stock typically ship within 2-7 business days after your order is placed.
Plant Addicts ships to the lower 48 states within the U.S. Unfortunately, we do not currently ship to Alaska, Hawaii, or internationally.
This plant cannot be shipped to the following states: AZ, CA, ID, MT, NV, OR, UT, WA, AK, HI. These restrictions apply only to this specific plant due to agricultural regulations or other limitations. Other plants may still be available for shipping to these states.
If you have any questions about shipping restrictions, feel free to reach out to our team!