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Double Knock Out® Rose

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Twice the beauty! Enjoy scores of lightly fragrant, cherry red flowers that have twice as many petals as the original Knock Out® Rose. Moss green foliage. Hardy and virtually maintenance-free — no deadheading to remove faded flowers. Reaches 3-4' tall and wide. Blooms from late spring until first frost. May be covered by U.S.P.P. #16202 or other patents. This patented variety is sold under license from the patent owner. Radtko cultivar


Bloom Color Red
Shade/Sun Full Sun
Soil Composition Loamy
Soil Moisture Well Drained
Soil pH Level 5.5 - 7.0
Zone Range 5 - 9

Zone Compatibility

This Variety's Zone Range 5 - 9
My Hardiness Zone ?
The USDA hardiness zones offer a guide to varieties that will grow well in certain climates. Each zone corresponds to the minimum winter temperatures experienced in a given area. Make sure that your hardiness zone lies within the zone compatability range of this variety before ordering.

Size & Spacing

Mature Size

When your plant matures, it will be approximately 3 - 4' tall x 3 - 4' wide.

Recommended Spacing

We recommend spacing these plants 3 - 4' apart to ensure room for growth.

Tools & Supplies

Having the proper tools and supplies when growing your own can make the difference between a good harvest and a great harvest! Here's a list that our experts recommend for this variety.

Planting & Care

Learn all about how to grow roses in The Growing Guide. An entire section of our website dedicated to your growing success.

Shipping Information

Estimated Delivery Date

You don't pay until it ships.

We work hard to make sure that your order arrives at the ideal time for planting in your location. That's why we only ship living products during certain times of the year. Order now and your credit card won't be charged until your climate is suitable for planting success and your order is shipped.

Our Promise of Satisfaction

1 Year Warranty

Every order comes with our promise of satisfaction. If you aren't completely satisfied with your order, let us know within one year for a free one-time replacement or refund.


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Questions & Answers

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Browse 29 questions Browse 29 questions and 147 answers
Why did you choose this?
Stark Bro's Store
I want roses ALL the time.
Karen S on Sep 22, 2018
We have six of these roses and they are always so red and beautiful and just bloom and bloom. We needed to replace a few rose bushes, not the knockout, so we are going to fill the space with the knockout rose bushes
Richard E H on Jul 7, 2018
I want roses ALL the time.
Karen S on Sep 22, 2018
Ease of care and continuous bloom
JANICE D on Aug 8, 2018
We have six of these roses and they are always so red and beautiful and just bloom and bloom. We needed to replace a few rose bushes, not the knockout, so we are going to fill the space with the knockout rose bushes
Richard E H on Jul 7, 2018
Because of past success with these roses.
Carol P on Jul 3, 2018
Every single rosebush that we have purchased from you in the past two years has flourished. However, several rosebushes that I purchased elsewhere (silly me!) are barely alive. The sickly ones are side-by side with your plants, so it isn't the soil. I plan to replace the unhealthy bushes with your reliable stock.
Elizabeth H on Jun 29, 2018
I love this rose this makes about 30 in our yard.
Oscar H on Jun 17, 2018
I chose this because of the color and the double petals :)
Carolyn W on Jun 13, 2018
Because I like how easy-care this rose is.
Nancy K S on Jun 13, 2018
For cutting flowers ????
Deborah M on May 28, 2018
these roses are my favorite. When I got cancer and was in the hospital for 30 days, my husband planted 50 of these on a hill side. They are in full bloom and people stop to look at them
Joyce R on May 22, 2018
We ordered 20 knockout roses last year from Stark Bros., and we're back for MORE!
Elizabeth H on May 6, 2018
We just received some as a gift, and in turn sending a set, to another couple. Our's where received in great shape. Just Dig a hole and place roses into hole. That simple.
Robert S on May 4, 2018
Lot of good references and recommendations.
Muhammad R on Apr 21, 2018
Seen them in other neighborhoods...they do very well.
Terre C on Apr 21, 2018
They are very hardy and look beautiful spring, summer, and fall. Very easy to take care of. The color is a beautiful shade of red which turns to a pink as the flowers fade. Love them. I have over a 110 plants of the Knock Out Rose in my yard in Pink and Red.
KATHY B on Oct 22, 2017
Beautiful, easy to grow, a win-win situation!
Carol M on Sep 28, 2017
I have several pots of knockout roses and they are so easy to grow and have almost continuous blooms. They have given me much pleasure. Everyone who sees them admires them and wants to know what kind of rose they are. I am ordering these to give as gifts.
Janet W on May 28, 2017
Produces beautiful flowers all summer and well into fall!
Kenneth F on May 27, 2017
Ordered some last year, they grew quickly and beautiful. Ordering more now!
Barbara G on Apr 12, 2017
Beautiful full bloom with outstanding color. Knockout roses grow well here on the plateau in middle Tennessee. They tolerate the hot, dry summers and icy winters much better than either the tea or floribunda roses.
Elizabeth H on Apr 3, 2017
Friend was looking for these to plant in yard. Wanted to send a thank you for her hospitality.
Laraine B on Mar 14, 2017
These are hardy and very pretty roses that bloom almost 9 months a year. I love them. I have about 35 at least in my gardens.
Sandy R on Mar 12, 2017
I had 8 of the double knock out roses and loved them. Unfortunately this winter we had a water leak and the 2 of the roses had to be removed to get to the leak. We are replacing those two. Love the way these bloom all summer.
Ina M on Feb 17, 2017
Looking forward to the double flowering.
Paul J on Nov 5, 2016
My love!
Margaret A on Sep 19, 2016
This performs very well in all types of weather. The blooms are very full and quite lovely.
Cindy A on Sep 1, 2016
Matches my existing roses and grows amazingly well with loads of blooms.
Aaron S on Aug 25, 2016
Knock out roses are the best
Janet H on Aug 6, 2016
I am giving one of these as a gift and planting one for myself. I have ordered several Knock Out roses from you before and they are beautiful planted in pots in my garden.
Margaret J on Jul 11, 2016
Love the look of the double knockout!
Shelly R on Jun 27, 2016
Pretty, easy to take care of
Ann Marie C on Jun 24, 2016
Drought and disease resistant and also pretty.
Sharon H on Jun 3, 2016
Because we love roses. These are growing so well and look so pretty.
Tonya J on May 17, 2016
I love the fact that they bloom so long
Sharon N on May 12, 2016
Adding to existing rose bed
LEE S on May 11, 2016
I have one Knock Out Rose bush that is just beautiful, at least a hundred blooms on it and has made it thru our winter for 2 years. Time for more.
Patricia M on Apr 30, 2016
I had one before in another house for 35 years. Roses are my favorite.
Henry L on Apr 26, 2016
Will add variety to my pink/red collection
Judith d on Apr 25, 2016
Because they've beautiful.and disease resistance...
Carolyn N on Mar 27, 2016
Love red I am 84 and I love to garden, trying to get as much perennials as possible in this year,
Rosemary W on Mar 22, 2016
We have had knock out roses in the landscape of two of our previous homes and liked the plant very much. We are landscaping our new home now and wanted to include them in our new home.
Paul H on Mar 11, 2016
Love the red, and pink but yellow is still my favorite in other roses, maybe it will be with these.
Agnes D L on Mar 1, 2016
I have purchased 3 of these rose bushes before. They grow well even without full sunlight. Need VERY little care.
Kathy R on Feb 23, 2016
Ease of care and continuous bloom
JANICE D on Aug 8, 2018
Because of past success with these roses.
Carol P on Jul 3, 2018
Can you grow knockout roses in containers?
Lynda C on Apr 22, 2016
BEST ANSWER: Yes you can. I put 3 of my roses in large pots in case the ones that I planted
did not survive. They all lived through one of the coldest winters that we have had
and I found places for those 3 plants this year. The ones in the ground did grow larger but they all grew well.
Should I cut back my Double knockOut Roses for wintering over? How do I care for them to prepare them for winter?
Michele W on Oct 15, 2017
BEST ANSWER: I would cover the ground under them with grass clippings, or straw, but not necessary to do anything else in my climate in Ga. I do feed mine 2 tablespoons of miracle grow even during the winter months, once a month with a gallon or so of water. They get all the acid they need from our famous Ga red clay.
will the double knock out roses do well in zone 10a ?
walter d on May 12, 2017
BEST ANSWER: You are right on the edge of the growing zone for Knock Outs. If you are near salt air, that will damage them, but if you can keep them out of hot late-afternoon sun and give them good air circulation, they should do OK.
is may to late to plant knock out roses ?
barbara c on May 12, 2016
BEST ANSWER: It should be fine as long as you give it enough---not too much!---water. Mine are doing great and they got planted in a late summer heat wave last year.
Will it grow in the shade? Garden faces North and receives just a bit of morning sun.
Danielle A on Mar 17, 2016
BEST ANSWER: Everyone that I know that has planted this particular rose, says they are very hardy regardless how you plant them. One guy even sprayed weed killer on his by accident, and they were still ok. Mine seem to prefer the full sun.
How many years do these last? My landscaper said, "Don't buy any. They only last 2 years." True? Or he is full of it??? LOL
susans on Aug 30, 2016
BEST ANSWER: They will last years. 9 years at our house so far. You can trim them in the fall the second year planted to eight inches or so. They grow quickly and are winter hardy.
How long does it take for these roses to get to their full size?
Ron H on May 12, 2016

I planted 18 of these roses last spring. All are thriving this spring with lots of buds. At one year in the ground the shortest is 25 inches the tallest 36 inches. None are quite as wide as they are tall. The growth will depend on quality of soil , moisture, and amount of sun. Mine got some bunny munching last spring and I had to use a hardware cloth wrap for protection. So, they lost some growth due to rabbits.
How big are these when I receive them ?
Iveng on Feb 20, 2016
BEST ANSWER: 12-18 inches. They grow very quickly and will bloom that year if you plant them in the spring. I strongly recommend!
Do knockout roses need to be cut back in the Fall?
Carol O on Nov 7, 2016
BEST ANSWER: I have not cut these back, but I have others that were bought locally and yes, I cut them back because I don't want them to get too big. I've had them about 10 years maybe and each year they come back as beautiful as ever.
will this rose grow in a flower pot?
nancy r on Jun 4, 2016
BEST ANSWER: Ours did. It's a beauty.
I'm in the south if I plant them in the summer will they survive?
Tessa on Jun 4, 2016
BEST ANSWER: Yes, you can plant them any time. Just make sure you water them deeply every day for a while and then taper off to every other day, until they get established. A brief summer shower may not provide enough water to get deep into the root area.
Does this rose have thorns?
Floyd on Oct 2, 2018
BEST ANSWER: Yes, this plant has thorns. However, the beauty of these double knockout rose plants outweigh the hassle of thorns...just wear very thick gardening gloves and you will be content.
Are these perennial?
Jordan on Sep 30, 2017
BEST ANSWER: To the best of my knowledge, all roses are perennial. These definitely are, as I have have mine for several years, and they are blooming right now.
How long do they bloom?
Earl L on May 23, 2016
BEST ANSWER: I'm in Michigan and I would say they will start blooming in June and keep going through October ... Maybe November. It just depends on when we get our first frost. Defiantly will have blooms all summer
Deer resistant or not?
Deborah M on May 31, 2018
BEST ANSWER: If they're hungry enough, deer may browse tender, unopened buds but will leave the shrub itself alone because of the thorns.
Is it thornless?
Jennie M on May 19, 2018
BEST ANSWER: No they are not thornless but very hardy and don't need the care the hybrid
tea roses need. They come back vigorously after bad winters.
Hi. Are these a true red or more of a pink? Thank you!
solange l on Feb 11, 2017
BEST ANSWER: They are definitely red but not an orangey red, they are a beautiful true red!
Is this rose very fragrant?
Jaime W on Jan 30, 2017
BEST ANSWER: No. The Double Knock Out Rose has no fragrance. It is very hardy, blooms
early and is beautiful until frost even in the very hot weather in the south.
But no smell.
How far apart should I plant along fence line? I want a continuous hedge look w
Debra S on Jun 14, 2016
BEST ANSWER: Hello! I used my roses to make a hedge down both sides of the front garden.mine are about 30 inches apart. This is their second year - clearly a line but not a solid line. If planted closer , well the line would close in faster. I choose to wait, because I wanted big strong plants and gave each a chance to grow without competition

I live in Southeast Michigan. Is it too late for the knockout roses to fully bloom?
Linda O on Jun 11, 2016
BEST ANSWER: It is never too late to plant a flower. Actually, if it gets a good "hold" and even
doesn't get the full growth this year, it will next year. They will still bloom this year and be such a joy. I would go ahead and much luck to you.
Do deer like these roses?
Elaine M on May 27, 2018
BEST ANSWER: Deer may eat the tender unopened buds if they're really hungry, but they generally don't like messing with thorns and will look for something else to eat before roses.
What typeof rose is a Knock out rose?
Debbie on Mar 21, 2018
BEST ANSWER: It is a hardy disease resistant fast growing rose that blooms almost all the time. The double knock outs are beautiful. They grow in almost any soil.
Does this rose form pretty rose hips through winter?
Jaime W on Jan 30, 2017
BEST ANSWER: All of The Knock Out?? Roses will produce hips in small numbers, but unlike some other roses, they quite as alluring. The flowers are the main attraction of Knock Outs.
What size are the flowers?
Amy D on May 7, 2018
BEST ANSWER: They are usually 3 to 3-1/2" in diameter.
what is the size of the hole to be digged for a 4" pot ?
DAVID L on May 6, 2017
BEST ANSWER: The hole should be at least 2.5' wide by 2.5'. Mix peat and/or composted manure at a rate of 1 part to 2 parts soil. Digging a good hole will give you a big, healthy rose bush that will last for many years.
are these one gallon pots?
Betty L on Apr 23, 2017
BEST ANSWER: No, much smaller, in 4" round pot. Rose arrived healthy
and did well.
How many times do the roses bloom a year?
Gladys J on Apr 7, 2017
BEST ANSWER: It blooms from late spring through early frost, continuously.
Floribundas? Grandifloras? Please advise as to breeding history. Thank you.
Cydsan on Nov 15, 2016
BEST ANSWER: The parents are a shrub rose and a floribunda.

Customer Reviews

4.4 / 5.0
57 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Alive and healthy, well packaged
I've purchased bare root roses, including Knockout, online and gallon containers at the big box stores. I was intrigued by the pricing for these live, shipped Knockout roses. It's a great value for live roses. I understood that these were being shipped in 4" containers, but the Q&A for this product indicates in several responses that these plants would be delivered as 12 - 18" specimens. All four of those I ordered are under 5" tall. They are absolutely actively growing and by all appearances, extremely healthy plants though. Just in case anyone else is confused about the size of the product delivered, apparently it varies. Mine are tiny plants which, once planted, will likely not be visible through most of this growing season.
April 29, 2016
over 2 years ago
Not as healthy as previous purchase of Double Knock Out Roses
I ordered 8 roses recently, but they arrived a little unhealthy. The leaves were a little yellowed, and the plants looked somewhat wilted. After planting them they got off to a slow start. They are growing, but one is very iffy, as it still shows signs of stress. The roses I ordered prior to these were healthy and vigorous, so beautiful. Trying to nurse the new ones back to health.
May 5, 2016
over 2 years ago
Double Knock Out Rose
I bought five plants one year ago. They were very small-4-6 inches and I was skeptical. One year later they are 2-3 feet high and loaded with roses and beautiful. Very pleased with these plants.
May 23, 2016
over 3 years ago
Easy Beautiful Roses
Double knock out red roses have been growing in my NC south facing yard for a year. They were about 3 feet tall at the end of last summer and after a winter trimming are now in mid-May back to 3 1/2 feet tall, with more growth to come through the summer. Continuous bloom. Deadheading is not necessary, but helps with appearance on occasion. Spraying not needed at all, as no disease attacks these plants. They love the heat and humidity and now that they are established, need minimal watering only during periods of drought. Neighbors appreciate their beauty!
May 21, 2016
over 3 years ago
Beautiful easy to grow rose
After ordering six Knockout Roses last year I decided to try a few more. They are the easiest and most beautiful roses I've ever grown. After only one season six of them are about 3' in diameter and covered with gorgeous red roses. I would highly recommend them.
May 22, 2016
over 3 years ago
Doing great the second go around.
I ordered 10 of these and planted them in the fall of 2014. Come spring I lost 6 plants and had to order more. I guess they weren't established well enough. Last year I fertilized and set up a irrigation system. So far they are about 3-ft high and starting to spread out after a early spring pruning. They have buds on them now so I'm looking forward to seeing this years blooms and growth. I planted these as a hedge with 3ft spacing
May 17, 2016
over 4 years ago
Double Knock Out Rose
Got this for my mother and she loves it. Even though her flowerbeds are very shady, it's still doing quite well and blooms a lot.
May 6, 2016
over 4 years ago
Much more than I could have hoped for.
I wanted color that would be constant for a very large flower bed and decided to use the Knock Out Rose to accomplish that. The plants were small when I got them but 3 were already blooming. The color was amazing. Strangers would stop and tell me the bed was beautiful. I need to say that it was the 1st. year and the bushes were hip high. They really are amazing and I love them.
May 12, 2016
over 3 years ago
Knock out roses a bust .
They arrived in good shape . Some made it a few months. One made it through the first winter. They seemed awfully small to withstand a winter. I replaced them with larger rose plants that gave survived nicely. I should have gotten a refund but lost track of the receipt. They all died. :-(((
May 18, 2016
over 4 years ago
My Red and Pink Double Knockout Roses
My wife and I moved west from Cincinnati, Ohio early in 2016 and purchased an 1859 house which was seated on an 8-foot wall and 6-foot incline overloking the street below. Having had great success with Stark Brothers' Double Knockout Roses in Cincinnati, and not wishing to risk injury by trying to mow that strip of grass above our rock wall, I purchased 15 Stark double knockout rose bushes, removed the grass and planted them on the slope. Needless to say, all bushes survived the winter and are flourishing and covered with a profusion of pink and red blooms. I would recommend Stark Brothers' double knockout roses to anyone for both their beauty and hardiness. They are a beautiful beacon of color on our hilltop house!
June 20, 2017
over 2 years ago