Rose (Rosa 'Double Knock Out') in the Roses Database

1 company sells this plant

Alternative cultivar names:
'Double Knock Out'

Also sold as:
Double Knockout

Data specific to Roses (Edit)
Bloom size: Medium: 2-3"
Petal count: full: 26-40 petals
Rose bloom color: Medium red
Extra Bloom Info: In clusters
Rebloom: Good
Class: Shrub
Growth Habit: Medium, 3-4 feet, bushy
Fragrance: None
Hybridizer & year: William J. Radler, 2004
Optimal growing zones: USDA zone 4 and warmer

General Plant Information (Edit)
Plant Habit: Shrub
Life cycle: Perennial
Sun Requirements: Full Sun
Soil pH Preferences: Moderately acid (5.6 – 6.0)
Slightly acid (6.1 – 6.5)
Neutral (6.6 – 7.3)
Slightly alkaline (7.4 – 7.8)
Plant Height: 3-4 feet
Plant Spread: 2-3 feet
Leaves: Deciduous
Flowers: Showy
Flower Color: Red
Flower Time: Spring
Uses: Cut Flower
Wildlife Attractant: Bees
Propagation: Other methods: Cuttings: Stem
Cuttings: Tip
Miscellaneous: With thorns/spines/prickles/teeth
Awards and Recognitions: Texas Superstar®
Parentage: unnamed seedling x unnamed seedling
Child plants: 3 child plants

Easy Rose Plant

A Week of Celebrating RosesA Week of Celebrating Roses
April 25, 2015

It's Roses Celebration Week, a week we've been looking forward to all year! This week we'll encourage everyone to share their photos, comments and information about roses. Let's open the week with a look at the top cultivars, top comments, most thumbed images, and more!

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Posted by ssgardener (Silver Spring, MD - Zone 7a) on Mar 12, 2013 6:06 AM

I have this in afternoon sun, maybe 4-5 hours of direct sun. It blooms beautifully, right up until a hard freeze in November.

Last year the blooms were so heavy and numerous that they flopped over. I don't know whether it's related to not getting full sun, or my poor pruning job in the spring. No more flopping after that first very heavy flush of blooming.

This is truly a carefree rose. They got a little bit of powdery mildew and black spot during mid-summer heat, but they recovered on their own without being treated. There was a bit of Japanese beetle damage, but no treatment needed for that, either. I give them a little osmocote in the spring and mulch with leaf mold and coffee grounds.

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Posted by Newyorkrita (North Shore, Long Island, NY ) on Oct 16, 2011 10:54 AM

No spraying needed on Double Knock Out ever. Plus this rose really does like to bloom a lot. Not as much as the single version though, and if I had to do it over again, I might have gotten the single version Knock Out instead. The blooms on Double Knock Out simply do not fall when done and stay on the shrub in messy brown rotting balls unless I cut them after bloom. So I always do have to prune after blooming if I want it to look attractive.

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Posted by SongofJoy (Clarksville, TN - Zone 6b) on Nov 24, 2011 9:00 AM

Performs spectacularly here in my zone (6b). Although not fragrant, I planted it next to a fragrant rose to make up for that one shortcoming.

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Posted by Debbie (Denham Springs, La. zone 8b - Zone 8b) on Jan 2, 2012 5:38 PM

Absolutely wonderful plant. After trying about 50 other different types of roses, and growing discouraged because of the diseases associated with Southern grown roses, I finally found a Rose that needs almost no attention. They never have blackspot or rust and in Southern Louisiana humidity, that is a miracle. They should be spaced at least 4 ft apart. They bloom constantly from spring to fall. I was even able to have a vase of roses on my table in November. They actually look like a Hybrid Tea, which I love. What a joy to have blooms all the time . They should be transplanted only in early Spring while they are dormant. I enjoy walking slowly thru my garden and as I walk, I simply snip the older dried up blooms off. (I carry small snips in my pocket). In just a little while, the bushes are all full of blooms again. Love, love this plant!

How to Prune a Knock Out® Rose by ConardPyle
Follow these simple steps to prune your Knock Out®
Step 1: When do I prune my rose bush?
Prune your rose bush in early spring, never in the fall and never in the winter. Check your rose bush from time to time as spring moves along and when you start to see new shoots growing from the canes on your rose bush, that’s a good sign that it is time to prune.
Step 2: Use proper tools
You will need a few basic tools when the time comes to prune your roses: gloves, because of the thorns on your rose bush. Lopping sheers, for some of the heavier canes that are going to be difficult to cut with some of the smaller sheers. Small hand sheers, for some of the finer work, and a pair of hedge trimmers to get the job done quickly.
Step 3: Determine how high you want to prune
Determining how high you want to prune depends on how high you want your rose bush to finish. Your rose bush will usually triple in size after pruning so cutting it back to about a foot will leave it at 3 feet when it finishes growing.

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Discussion Threads about this plant
Thread Title Last Reply Replies
Favorite roses at this time by Canadian_Rose Aug 27, 2018 6:58 PM 41
Why are roses so stressful? by CrazedHoosier Aug 14, 2018 3:36 PM 65
How does Lemon Fizz compare to Yellow Knock Out? by Frillylily Jul 29, 2018 4:32 PM 25
Roses dying? Help! by LeilaChrystina Jun 21, 2018 5:14 PM 1
Roses behind azaleas? by bkrell Apr 13, 2018 8:19 PM 4
🌹OCTOBER 2017 Bloom and Chat 🌹 by IrisLilli Oct 31, 2017 11:48 AM 176
🌹SEPTEMBER 2017 Bloom and Chat 🌹 by IrisLilli Oct 2, 2017 8:45 AM 153
Rose vigor by Steve812 Aug 22, 2017 9:21 PM 65
✺ June 2017 Bloom and Chat ✺ by Calif_Sue Jul 17, 2017 11:41 PM 335
Giving up on roses by stillwood Feb 11, 2017 9:28 AM 12
December 2016 -- Photos and Chat by zuzu Dec 31, 2016 6:16 AM 171
Please help find out what's wrong with this rose by zolotoy Jul 6, 2016 10:14 AM 7
Please help? by Oldfatguy Jul 2, 2016 11:56 AM 27
April 2016 -- Photos and Chat by zuzu May 2, 2016 7:36 PM 185
Pruning David Austin/ English roses by lisaely Mar 23, 2016 8:51 AM 15
Shopping for roses by Henhouse Oct 5, 2015 10:42 AM 14
Washington Post article on Knock Out Roses by mellielong Jul 25, 2015 5:51 PM 4
March 2015 -- photos and chat by Calif_Sue Apr 5, 2015 12:18 PM 55
Finally, 1 whole year with no Rose Rosette virus outbreaks! by gemini_sage May 2, 2017 7:50 PM 81
These rose bushes are in our back yard. Can you identify? by MayorShinn Dec 6, 2014 7:29 PM 9

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