Growing Zones: 5-10 outdoors(hardy down to -10℉) 5-10 outdoors
- Mature Height:
- 3-4 ft.
- Mature Width:
- 3-4 ft.
- Growth Rate:
- Botanical Name:
- Rosa 'Radtko'
- Does Not Ship To:
Double the Petals on Double the 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, too.
Amazingly, horticulturists have improved the original, incredible variety to create the Double Knock Out Rose. And when these amazing little botanicals are planted in rows, they reach approximately 4 feet in height, making a great hedge or boundary. Use them to add color to your home or a wonderful scent to your back patio.
Plus, this cultivar thrives in containers or in the ground. This improved variety will even grow in the shade, giving you more areas to plant. Best of all, improved cold hardiness means it stays lush in growing zones 5 to 10.
With plenty of blooms to spare, you'll enjoy fresh cut roses in your home from spring until fall. Depending on your soil conditions, your blooms can range from dark to light red. And we prune your Knock Out® Roses before we ship them to give you an explosion of growth shortly after you plant them.
These amazing rose bushes will sell out quickly. We recommend that you order now while supplies are still available. Elevate the elegance of your garden with the effortless Double Knock Outs!
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Customer Reviews & Photos
Knockout rose plant
There aren't any flowers yet however it is growing nicely with beautiful leaves. When the flowers will bloom I will send you more feedback
Flowers have no scent
Did great on my rooftop garden low maintenance but I was surprised that the flowers have no scent kind of weird
Doing great so far
Received two bushes and the tree. All three are doing great and still blooming even into the 3rd week of Oct. I received mine in Aug. 2018 so they took about 2 weeks to recover from shipping/planting but they came very healthy with blooms on them. Very satisfied.
Shipping across the country and the roses are still in great shape.
Roses came in great condition and have started blooming as soon as I planted them. I can't wait to see them grow into full sized bushes.Our growing is a 9/10 and they are holding up well to the heat.
Planting & Care
Knockout roses are easy to grow and do not require special care. They are one of the most disease resistant roses on the market today. They have stunning flower power with a generous bloom cycle (about every 5-6 weeks) that will continue until the first hard frost. All members in Knockout roses family are self-cleaning so there is no need to deadhead. Knockout roses are winter hardy to USDA Zone 5 and heat tolerant throughout the entire U.S. They thrive in almost every area of the country.
Seasonal information: Knockout roses are upright shrubs that form a tidy mound 3 to 4 feet high and bloom from June to the first hard frost. In spring, trim any broken or dead branches. You can shape the Knockout rose at this time. In zones with cold, wet winters, give your Knockout rose winter protection by planting on the leeward side of buildings or walls. Or you can wrap snow fencing loosely around the rose and cover with straw.
Selecting a location: Choose a well-drained site in full to partial sun. If you choose partial sun, make sure your Knockout roses receive at least six hours of direct sun a day (afternoon shade is better than morning shade). If you have clay or sandy soil, work well-rotted manure or compost into the planting site.
1) You should start by digging a hole twice as wide and twice as deep as the root ball.
2) Mix the manure or compost with the soil you have removed.
3) Back fill the soil until you have a hole the same size or slightly larger than the container the rose is in.
4) Plant the rose at the same depth as it is in the container.
5) Space Knockout roses plants three feet apart.
6) Mulch the planting site to retain soil moisture and keep competing growth from coming up around the rose bush.
Watering: Keep Knockout roses moist at all times. Water around the roots rather than overhead (or showering).
Fertilization: Fertilize with an organic rose fertilizer once a month. Use organic fertilizer rather than synthetic fertilizers as synthetics can promote weak growth and your rose will have more foliage and less flowers.
Pests and Disease: Knockout roses are resistant to rust, black spot and powdery mildew.
Pruning: Avoid pruning the Knockout roses at all in the first 2 to 3 years. Sterilize your sharp pruning shears with hot water or rubbing alcohol. This guarantees a cleaner, healthier cut. Always prune at an angle and not straight across. Activate the Knockout roses into growth and blooming by pruning it back a little in the spring after the last hard freeze. Keep the Knockout roses under control or if you want it smaller than it's 3-feet wide by 4-inches tall size by pruning it back in the late summer or early fall. Remove dead or old canes at any time. Also cut very thin canes that might be coming up from the ground. Prune your mature plants by using the 1/3 rule each year in the spring. Remove 1/3 of the oldest canes and any stems that are damaged, diseased or dead.
Most items ship the next business day unless otherwise noted
Estimated Shipping Time: Most orders ship immediately, however some orders may ship in 1-2 business days (we do not ship on the weekends) from date of purchase. As noted on the website, some items are seasonal, and may only ship in spring or fall. Once your order is shipped, you'll receive an email with a tracking number.
|Amount of Order||Shipping Charge|
|Less than $15||$11.95|
|$149 & above||Free Shipping!|
You can still order, but due to cold weather, we have delayed shipping to the areas shaded on the map below. We want your new plant to thrive right out of the box, so we will wait on shipping your order until the weather is ideal. This includes anyone in
Growing Zones 3, 4, 5 or 6. If you are unsure of your growing zone, visit our
Growing Zone Finder.
We will resume normal shipping in the Spring. Please see the table below for your approximate ship date.
|Growing Zone||Shipping Resumes|
|Zones 3 & 4||Week of April 29th|
|Zones 5||Week of April 14th|
|Zones 6||Week of April 7th|
|Zones 7-11||Ships Now!|