Double Knock Out® Rose Shrub

Rosa 'Radtko'

One of the most popular rose varieties, blooming consistently summer through fall

More resistant to pests, black spot, rust, and mildew than any other variety

Improved variety will even grow in the shade, giving you more areas to plant



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Double the Petals on Double the Roses

Why Double Knock Out® Roses?

Boasting one of the longest blooming periods available, from early summer to late fall, the Double Knock Out® Rose gives you all the amazing characteristics of the original Knock Out® Rose - just with more petals and even better disease resistance.

Even better? Not only is this cultivar more resistant to black spot, rust, and mildew, but it's also more resistant to insects. That means the Double Knock Out® is virtually maintenance-free, especially since it grows thickly without pruning. Plus, it thrives in containers or in the ground. 

About Knock Out® Roses: First introduced in 2000, the “Knock Out” family of roses has revolutionized the rose industry and remains the most prolific flowering shrub ever introduced. Each of the varieties in the brand are disease resistant, require minimal maintenance, and produce continuous blooms that last from spring to fall.

Why Fast-Growing-Trees.com is Better

With plenty of blooms to spare, you'll enjoy fresh cut roses in your home from spring until fall. And depending on your soil conditions, your blooms can range from dark to light red, offering even more versatility. And we prune your Knock Out® Roses before we ship them to give you an explosion of growth. Because of our hard work at the nursery and tried-and-true shipping process, you get a greater chance of success at home.

Looking for more roses to add to your collection? Check out our guide to popular types of roses.

Full Planting & Care Instructions

Product Details

Mature Height:3-4 ft.
Mature Width:3-4 ft.
Sunlight:Full Sun, Partial Shade
Bloom Season(s):Spring Blooming, Summer Blooming, Fall Blooming
Growth Rate:Moderate Growing
Botanical Name:Rosa 'Radtko'
Does Not Ship To:AZ
Grows Well In Zones:5-10 outdoors
grow zone map

Growing Zones: 5-10 outdoors

(hardy down to -10℉)

Customer Reviews & Photos

4.6

Based on 465 reviews

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Bronwynn S.
7/18/2025
Verified Buyer

TOTALLY Knock Out Gorgeous

My rose bushes arrived well packaged. They were knocked around pretty good during shipping, but I got them in the ground and are thriving! They are definitely hearty. I am happy with this purchase.

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Beckie H.
7/16/2025
Verified Buyer

Looking good

Hello. . the shrub looked weak when I received it, but began doing much better within a week. I’ve put it into a large planter and new growth is happening. No blooms yet but I’m not sure if I should expect them yet. First time buying a rose anything.

Fast Growing Trees Plant ExpertHi Beckie, thank you for your review. We're glad to hear your rose is settling in and showing new growth. That's a great sign. It’s completely normal for roses to take a little time to adjust, especially in a new container. Feel free to reach out if you ever need care tips or have questions about blooming. We're happy to help.
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Sharon B.
7/15/2025
Verified Buyer

rose

well packaged-arrived looking healthy-planted right away-so far so good-a bit soon to tell hpw it will do

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Lisa P.
7/14/2025
Verified Buyer

Low maintenance, fast growing, and extreme weather tolerant

We planted these double knockout roses two years ago using the root boost and then fertilizing every few months. Our summers have been brutal, with long hot days exceeding 100 degrees. The winters have been just as extreme, with freezing temperatures sinking below 20 degrees. These roses remain hardy and deep green all year long and show off magnificent blooms most of the year. We couldn’t be happier with our purchase. These low maintenance roses are the highlight of our driveway and entrance landscaping.

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Sandra V.
7/14/2025
Verified Buyer

Rose

My experience was great!! I love my rose bush.

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