Red Double Knock Out® Shrub Rose
Rosa 'Radtko'
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Red Double Knock Out® Shrub Rose - #1 Container is backordered and will ship as soon as it is back in stock.
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- Prevents restricted plants from shipping to your state
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Delivery and Shipping
Delivery and Shipping
Delivery and Shipping
Fast, Safe Plant Delivery
Ships in 3-4 business days • Tracking provided • Weather protected
| Under $50 | $9.99 |
| $50 - $99.99 | $14.99 |
| $100 - $149.99 | $16.99 |
| $150+ | $24.99 |
✓ Zone-specific timing • ✓ Professional packaging • ✓ Health guarantee
Understanding Plant Options
Nature Hills offers plants in two main formats:
- Container Plants: Grown in pots with soil, sized by container volume and plant age
- Bare Root Plants: Dormant plants without soil, sized by height measurements
Container Plant Sizes
Container sizes indicate plant age and growing capacity rather than liquid volume equivalents. Our containers follow industry-standard nursery "trade gallon" specifications, which differ from standard liquid gallon measurements.
Young Plants (6 months to 18 months old)
| Container Size | Actual Volume | Metric Equivalent |
|---|---|---|
| 2" x 2" x 3" | 0.18 - 0.21 dry quarts | 0.20 - 0.23 dry liters |
| 4" Container | 0.31 - 0.87 dry quarts | 0.35 - 0.96 dry liters |
| 4.5" Container | 0.65 dry quarts | 0.72 dry liters |
| 6" Container | 1.4 dry quarts | 1.59 dry liters |
| 1 Quart | 1 dry quart | 1.1 dry liters |
| 5.5" Container | 1.89 dry quarts | 2.08 dry liters |
Established Plants (18 months to 2.5 years old)
| Container Size | Actual Volume | Metric Equivalent |
|---|---|---|
| 2 Quart | 2 dry quarts | 2.2 dry liters |
| #1 Container | 2.26 - 3.73 dry quarts | 2.49 - 4.11 dry liters |
| 5" x 5" x 12" | 3.5 - 4.3 dry quarts | 3.85 - 4.74 dry liters |
Mature Plants (2-4 years old)
| Container Size | Actual Volume | Metric Equivalent |
|---|---|---|
| #2 Container | 1.19 - 1.76 dry gallons | 5.24 - 7.75 dry liters |
| #3 Container | 2.15 - 2.76 dry gallons | 8.14 - 12.16 dry liters |
Large Plants (3-5 years old)
| Container Size | Actual Volume | Metric Equivalent |
|---|---|---|
| #5 Container | 2.92 - 4.62 dry gallons | 12.86 - 20.35 dry liters |
| #6 Container | 5.25 - 6.01 dry gallons | 23.12 - 26.42 dry liters |
| #7 Container | 5.98 - 6.53 dry gallons | 26.34 - 28.76 dry liters |
Bare Root Plants
Bare root plants are sold by height from the root system to the top of the plant. Plants may exceed minimum height requirements.
Common Sizes:
- Trees: 1 foot, 2 feet, 3 feet, 4 feet, 5 feet, 6 feet
- Shrubs & Perennials: 1 foot, 18 inches, 2 feet
Important Notes
Container Volume Specifications
- Trade Gallon Standard: Our containers follow industry-standard "trade gallon" specifications established by the American National Standards Institute (ANSI Z60.1) for nursery stock
- Volume Variations: Actual soil volume may vary due to plant root systems and growing medium settlement
- Age Indicators: Container size primarily indicates plant age and maturity rather than liquid volume equivalents
Growing Conditions
- Plant size can vary based on variety and growing conditions
- Container size helps indicate plant maturity and establishment level
- Larger containers generally mean more established root systems and faster landscape establishment
Seasonal Availability
- Bare root plants are available seasonally when dormant
- Container plants are available throughout the growing season
- Specific varieties may have limited availability in certain sizes
Questions?
For questions about specific plant sizes or availability, please contact our plant experts who can help you choose the right size for your landscape needs.
Plant Highlights
Red Double Knock Out® Shrub Rose highlights at a glance!
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Brand
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Plant Class
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Botanical Name
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Characteristics
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Growing Zones5, 6, 7, 8, 9, 10
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Mature Height
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Mature Spread
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Sun ExposureFull Sun
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Moisture
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Soil
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Growth RateMedium
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Flower Color
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Fall Color
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Pollinator FriendlyYes
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Pruning Time
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Bloom PeriodLate Spring, Summer, Fall
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Photos Provided ByStar Roses and Plants - www.starrosesandplants.com
Growing Zones
What makes Red Double Knock Out® Rose special?
It blooms non-stop with cherry-red double flowers from spring to frost while being virtually maintenance-free.
What Growing Conditions Does It Need?
Red Double Knock Out® Rose thrives in USDA zones 5-9 and needs full sun with at least 6 hours of direct light daily. Plant in well-drained soil with organic amendments. This compact shrub reaches 3-4 feet tall and wide at maturity.
Give it moderate water once established and ensure good air circulation around the plant. While drought-tolerant when mature, regular watering produces the most abundant blooms.
How Do I Plant and Care for Red Double Knock Out® Rose?
Dig a hole twice as wide as the root ball and just as deep. Mix in compost and place the plant at the same depth it was growing in the container. Water thoroughly and apply 3-4 inches of mulch.
For hedges, space plants 2 feet apart on center. Apply slow-release rose fertilizer in early spring and mid-summer. The best part? No deadheading needed - spent blooms fall off naturally.
Prune only if desired in early spring to shape or reduce size. Wear gloves when handling as thorns are sharp.
What Are the Key Benefits?
This rose delivers waves of double red blooms that keep coming all season without the fuss of traditional roses. You'll have enough flowers for cutting bouquets while still enjoying a full display in the garden.
Disease resistance to black spot, powdery mildew, and rust means no spraying or special treatments. It even handles humidity and drought like a champ once established.
Pollinators love the blooms, and you'll enjoy orange rose hips and purple fall foliage after frost. Perfect for foundation plantings or containers on sunny patios.
What Should I Know Before Buying?
Plant in spring after last frost or in fall before first frost for best establishment. More sun equals more flowers - aim for at least 6 hours daily. Poor drainage will cause problems, so amend clay soils or plant in raised beds.
Pair with other Knock Out® varieties for a colorful hedge or mix with lavender and ornamental grasses. Consider adding Root Booster at planting for faster establishment.
Remember this rose has thorns, so keep away from high-traffic paths. Container growing works great for patios - just use a pot at least 18 inches wide.
