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

Alternative cultivar names:
'Knock Out'
'Purple Meidiland'

Also sold as:

Data specific to Roses (Edit)
Bloom size: Medium: 2-3"
Bloom shape: Other: Saucer-shaped
Petal count: semi-double: 8-15 petals
Rose bloom color: Red blend
Extra Bloom Info: Single to semi-double, in small clusters
Rebloom: Excellent
Class: Shrub
Extra Color Info: Cherry red
Growth Habit: Medium, 2-4 feet, bushy
Fragrance: Mild
Misc: Shade tolerant
Hybridizer & year: William J. Radler, 1988
Optimal growing zones: USDA zone 4 and warmer
Awards: Earth-Kind Rose
ADR: 2002
AARS: 2000

General Plant Information (Edit)
Plant Habit: Shrub
Life cycle: Perennial
Sun Requirements: Full Sun
Full Sun to Partial Shade
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)
Minimum cold hardiness: Zone 4b -31.7 °C (-25 °F) to -28.9 °C (-20 °F)
Plant Height: 2-4 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®
Other: Australian National Rose Trials Gold Medal 2003
Parentage: seedling x seedling
Child plants: 3 child plants


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 sandnsea2 (Cape Cod, MA, USA - Zone 7a) on Oct 2, 2011 4:16 PM

Unbelievable! Blooming from spring through fall here in Zone 7B. Everyone comments on it. Carefree and beautiful anywhere. Love this rose. Never thought I would, as I have mostly David Austin roses, but you have to admire the tenacity of this big performer.

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Posted by Newyorkrita (North Shore, Long Island, NY ) on Feb 7, 2014 6:54 PM

Knock Out is a wonder. A perfectly disease-free rose covered in blooms all season long. I must say it is more like owning a flowering shrub than most roses. Knock Out is the rose for people who think they can't grow roses or don't want anything fussy or harder to take care of.

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Posted by wildflowers (North East Texas - Zone 7b) on Aug 27, 2014 11:49 AM

These are really carefree roses and heavy bloomers. I have three different Knock Out roses and one of them unexpectedly has a nice rose scent. I find the color beautiful and soothing to look at. Deadhead them and they will continue to bloom all summer long.

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Plant Events from our members
piksihk On December 1, 2015 Bloomed
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Discussion Threads about this plant
Thread Title Last Reply Replies
Wow! by zuzu Jun 18, 2012 3:56 PM 3
Can you please help me identify what is wrong with my roses by Bobson Sep 19, 2019 6:15 PM 10
When to prune Knock Out roses? by cinvasko Sep 15, 2019 8:04 AM 3
September 2019 -- Photos and Chat by zuzu Sep 20, 2019 5:32 AM 151
Fed up with Sunny Knock Out by KenNEGA Aug 20, 2019 9:40 AM 4
rose rings by BigAppleRoseGuy Aug 18, 2019 7:53 PM 9
Rosette Disease??? by Weluvroses Aug 21, 2019 11:09 AM 59
Garden photos... by jim1961 Sep 18, 2019 12:43 AM 131
Thornless rose changing color and developing thorns by hopkimy Jul 21, 2019 12:35 PM 10
Orange Roses by GoldBeardThePirate Aug 14, 2019 8:05 PM 85
best Full rose bush photos by GoldBeardThePirate Aug 27, 2019 1:48 AM 51
Rose Rosette Disease by gardengirl1219 Jul 4, 2019 8:32 PM 3
July 2019 -- Photos and Chat by zuzu Aug 2, 2019 12:08 AM 307
Knock Out Rose troubles by klbrooks5 Jun 26, 2019 5:57 AM 7
What in the world is eating my Knockouts? by Judy_K Jun 20, 2019 6:14 PM 5
Dr. Huey rootstock by reh0622 Jul 2, 2019 10:54 AM 21
Yolande or another rose? by Mustbnuts Jun 11, 2019 11:38 AM 7
Knock out help by Bethadilly Jun 5, 2019 11:37 AM 6
Our Roses by Weluvroses Sep 19, 2019 4:25 PM 190
June 2019 -- Photos and Chat by zuzu Jul 27, 2019 9:37 AM 355
What's wrong with my rose? by Luckynjun1 May 31, 2019 12:16 PM 32

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