Red Double Knock Out® Rose

Rosa 'Radtko'

$32¹⁷ $36⁴⁷

In Stock

Enter your ZIP code to check shipping availability.

Find your Growing Zone

Plant Size

#1 Container #2 Container #3 Container

Product variants

Plant Sentry™

Delivery and Shipping

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 Profile & Growing Essentials

Disease resistant, Flowering, Attracts pollinators, Drought resistant, Cold hardy, and Deer-resistant

Specifications

Botanical Name

Rosa 'Radtko'
Height

3-4 ft
Width

3-4 ft
Growing Zones

5-11
Sunlight
- Full sun
Growth Rate

Moderate
Flower Color
- Red
Leaf Color
- Green
Fall Color

Purple
Pollinator Friendly

Yes
Pollinator Required

No
Bloom Period

Late Spring, Early Summer, Late Summer, Early Fall, Late Fall
Does Not Ship To

AK, HI, ID, MT

Planting & Care Instructions

Where to Plant

Sunlight: Aim for at least 6 to 8 hours of direct sun daily to maximize flower production. While this rose tolerates partial shade, you will likely see fewer blooms and "leggier" growth in lower light.
Soil: These plants prefer rich, well-drained soil with a slightly acidic pH. If you are working with heavy clay, mix in compost or peat moss to improve drainage so the roots do not sit in standing water.

Watering Requirements

Focus on deep soakings twice a week during the first growing season to help the roots anchor deep into the ground. Once established, these roses are surprisingly drought-tolerant, but they still need consistent moisture to fuel their repeat blooming cycle. If watering becomes too sporadic, the plant will survive, but it will stop producing new flower buds until conditions improve.

Pruning Tips

Since Red Double Knock Out® roses bloom on new wood, the best time to prune is late winter or early spring before green shoots appear. Cut the entire bush back to about 12 to 18 inches high to stimulate vigorous fresh canes. Think of this annual "haircut" as a reset button that keeps the shrub dense and ensures flowers cover the plant from top to bottom.

Fertilizer Needs

Apply a balanced granular rose fertilizer in early spring when the first leaves unfurl, and consider a second light application after the first wave of blooms finishes. Avoid fertilizing after late summer because this encourages soft, tender growth that will be damaged by the first winter freeze.

Growing Zones 5-11

Find Your Growing Zone!

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.

Under $50	$9.99
$50 - $99.99	$14.99
$100 - $149.99	$16.99
$150 - $198.99	$24.99
$199+	FREE

Red Double Knock Out® Rose

Rosa 'Radtko'

Plant Sentry™

Delivery and Shipping

Specifications