Red Double Knock Out® Rose

Rosa 'Radtko'

Knock Out Roses®

Non-Stop Cherry-Red Double Blooms from Spring to Frost, Virtually Maintenance-Free
Heat Tolerant: Thrives in Zones 5-11
Grows 3-4 ft Tall and Wide
Ideal for Privacy Screen or Hedge
Pollinator-Friendly Shrub

$18¹⁵

Shipping calculated at checkout.

In Stock

Enter your ZIP code to check shipping availability.

Find your Growing Zone

Plant Size

Quart Container #1 Container #3 Container #2 Container

Product variants

Planting & Care

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.

Delivery and Shipping

Shipping Rates

Ships in 7-10 business days • Tracking provided • Weather protected

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

✓ Zone-specific timing • ✓ Professional packaging • ✓ Health guarantee

Understanding Our Container Sizes

At Nature Hills, our plants are sold in industry-standard nursery containers. You will notice we use the word "container" rather than "gallon." Container numbers follow a nursery trade size standard, not liquid volume. The number tells you the plant's size category and general maturity level. A larger container means a more established plant with a stronger root system.

Container Sizes

Quart

Plant age: 6 months to 1 year
Best for: Ground covers, perennials, ornamental grasses
What to expect: Our smallest and most affordable size. Well-suited for planting in multiples across a large area. Allow 1 to 2 seasons for full establishment.

#1 Container

Plant age: 1 to 2 years
Best for: Shrubs, perennials, smaller trees
What to expect: About the size of a large coffee can. A well-developed root system in a manageable size. Good value choice when you have time to let the plant grow into the space over a season or two.

#2 Container

Plant age: 2 to 3 years
Best for: Shrubs and trees where you want faster establishment
What to expect: A noticeable step up from a #1 in both plant size and root development. Good choice when you want visible presence without going to a larger size.

#3 Container

Plant age: 3 to 4 years
Best for: Most plants, most situations — flowering trees, shade trees, evergreen shrubs
What to expect: Our most popular size. Strong, developed root system. Plants in a #3 container make an immediate visual impact from day one. If you want a head start rather than waiting seasons for a plant to fill in, this is typically the right choice.

#5 Container and Larger

Plant age: 4 to 5+ years
Best for: Specimen plants, privacy screens, maximum instant impact
What to expect: Large, mature plants ready to make an immediate statement in your landscape. We also carry #7 and larger sizes for select varieties.

Why "Container" and Not "Gallon"?

Nursery container sizes follow an industry trade standard established for the nursery and horticulture industry. The number is a size designation, not a measurement of liquid volume. Actual soil volume varies by plant type, root mass, and growing medium. Using "container" is the accurate industry term. When you see #1, #2, or #3, think of it as the plant's size tier, not a gallon measurement.

Root Pouch Containers

Some Nature Hills plants arrive in a Root Pouch, a breathable fabric container made from 100% recycled materials. Root Pouches encourage denser root development through air pruning, which discourages root circling and promotes a stronger, more fibrous root ball at the time of planting.

Plants growing in Root Pouch fabric containers, showing the breathable woven fabric construction

There are two types. Knowing which one you have changes how you plant:

Degradable (brown or tan fabric): Plant the entire pouch directly in the ground. The fabric breaks down naturally in the soil over time.
Non-degradable (black or gray fabric): Remove the pouch before planting. Cut the bottom open with scissors, then peel the sides away. The fibrous root ball will hold its shape.

Not sure which type you have? Check the tag on your plant or contact us and we will confirm.

Full Root Pouch planting guide

Choosing the Right Size

Size	Plant Age	Best For
Quart	6 mo to 1 yr	Ground covers, perennials, grasses. Budget-friendly for mass plantings.
#1 Container	1 to 2 yrs	Shrubs, perennials, small trees. Value choice for patient gardeners.
#2 Container	2 to 3 yrs	Shrubs and trees where you want faster establishment.
#3 Container	3 to 4 yrs	Most plants. Immediate visual impact. Our most popular size.
#5 and larger	4+ yrs	Specimen plants, privacy screens, maximum instant impact.

Still not sure which size is right for your project? Our plant specialists are happy to help. Contact us and we will point you in the right direction.

Plant specifications
Plant Characteristics	Disease resistant, Flowering, Attracts pollinators, Drought resistant, Cold hardy, Deer-resistant
Hardiness Zone	5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b, 11a, 11b
Sunlight	Full sun
Height	3-4 ft
Width	3-4 ft
Watering Needs	Moderate
Preferred Soil	Clay, Loamy
Growth Rate	Moderate
Growth Habit	Climbing, Spreading, Trailing, Upright
Blooms In	Spring, Summer, Fall
Flower Color	Red
Foliage Color	Green
Pet Safety	Toxic to pets
Suitable Space	Indoors, Outdoors, Container
Plant Name	Rose
Botanical Name	Rosa 'Radtko'
Species	spp.
Cultivar	Radtko
Class	Magnoliopsida, Rosales
Does Not Ship To	AK, HI, ID, MT, PR

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. For a complete seasonal care calendar and pruning tips, see our Knock Out Roses Complete Guide.

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.

Explore More from Nature Hills

The Red Double Knock Out® Rose is part of our beloved collection of knock out® roses, which are among the most reliable flowering shrubs you can grow. These hardy roses are naturally deer resistant plants that provide continuous blooms with minimal fuss. For expert growing tips and companion planting ideas, check out The Complete Guide to Knock Out Roses: Varieties, Care & Landscaping Ideas and learn more about Shrub Roses: What Are They & The Top 5 For Your Garden!

Red Double Knock Out Rose makes a thoughtful Mother's Day gift. Browse our Mother's Day flower collection for more spring blooming gift ideas.

Free shipping

On all orders over $199
Plant Sentry™

Compliant guaranteed
Easy returns

Hassle free returns policy
Live Chat

Talk to a real person

Frequently Asked Questions

Does the Red Double Knock Out® Rose require deadheading?

No, the Red Double Knock Out® Rose requires no deadheading since spent blooms fall off naturally. This self-cleaning feature is one of its key low-maintenance benefits. Simply let the plant do its work and enjoy continuous blooms from spring to frost without any intervention.

What are the watering requirements for the Red Double Knock Out® Rose after planting?

Water thoroughly at planting, then provide moderate water once established. While drought-tolerant when mature, regular watering produces the most abundant blooms. Keep soil consistently moist but well-drained for best results.

Does the Red Double Knock Out® Rose need overwintering protection?

Red Double Knock Out® Rose is hardy in USDA zones 5-9 and typically needs no winter protection in these areas. In zone 5, apply 3-4 inches of mulch around the base after the first hard frost for extra root insulation.

What is the best time of year for shipping Red Double Knock Out® Roses?

Spring after last frost and fall before first frost offer the best shipping windows for Red Double Knock Out® Roses in zones 5-9. These timing windows allow proper root establishment before temperature extremes. Check your local frost dates and plan accordingly for optimal planting success.

How will my Red Double Knock Out® Rose arrive—bare root, potted, or shipped in what condition?

Your Red Double Knock Out® Rose ships as a healthy potted plant, ready to transplant into your garden. Plant after the last frost in spring or before first frost in fall for best establishment in zones 5-9. Shop at Nature Hills for quality container-grown roses.

Is the Red Double Knock Out® Rose deer-resistant?

Red Double Knock Out® Rose is not specifically deer-resistant, though deer preferences vary by region and food availability. The thorny stems may provide some deterrent, but hungry deer will often browse roses regardless. For best protection in deer-heavy areas, use physical barriers or deer repellent sprays during growing season.

What is the size of the individual blooms on the Red Double Knock Out® Rose?

The Red Double Knock Out® Rose produces classic double blooms that are perfect for cutting bouquets while maintaining a full garden display. These cherry-red flowers appear in continuous waves from spring to frost without deadheading. Plant in full sun with 6+ hours of direct light for maximum bloom production.