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:AK, AZ, HI
Grows Well In Zones:5-10 outdoors
grow zone map

Growing Zones: 5-10 outdoors

(hardy down to -10℉)

Customer Reviews & Photos

4.7

Based on 553 reviews

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Lorna D.
5/31/2026
Verified Buyer

Double knock out roses

Impressed with roses,arrived healthy & doing well planted, the growth is improving weekly.

Fast Growing Trees Plant ExpertWe're so thrilled your Double Knock Out Roses arrived healthy and are improving weekly, Lorna! Weekly growth is such a wonderful sign that they're happy and establishing beautifully. Those gorgeous blooms are going to be absolutely stunning. Thanks for the wonderful update and for choosing us!
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Michael G.
5/28/2026
Verified Buyer

Pleased

They arrived in good condition one stem was bent. we planted them and they are doing well I am just waiting for the growth they will add to the visuals of our yard

Fast Growing Trees Plant ExpertHi Michael, we're sorry about the one bent stem and will share that with our carrier. The fact that they're already planted and thriving is wonderful. Those gorgeous blooms are going to add so much color and visual impact to your yard. We can't wait to hear how they fill in!
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fergus h.
5/27/2026
Verified Buyer

great plant arrived in great

great plant arrived in great condition and is thriving

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Khadija S.
5/25/2026
Verified Buyer

Roses for the Texas sun

These came with some roses on them. They’re perfect for the Texas heat.

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Ronald P.
5/25/2026
Verified Buyer

New Rose Shrubs

They look healthy. Still weeks away from the first bloom.

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