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

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

Also sold as:
Knockout

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
Fragrant
Flower Color: Red
Flower Time: Spring
Summer
Fall
Uses: Cut Flower
Wildlife Attractant: Bees
Butterflies
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

Image

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!

(Full article6 comments)
Give a thumbs up

This plant is tagged in:
Image Image Image Image Image Image Image Image Image Image

Comments:
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.

[ Reply to this comment | Give a thumbs up ]

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.

[ Reply to this comment | Give a thumbs up ]

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.

[ Reply to this comment | Give a thumbs up ]

Plant Events from our members
piksihk On December 1, 2015 Bloomed
» Post your own event for this plant

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

« Add a new plant to the database

» Search the Roses Database: by characteristics or by cultivar name

« See the general plant entry for Roses (Rosa)

« Visit the Roses forum

« The Roses Database Front Page

« The Plants Database Front Page

Today's site banner is by dirtdorphins and is called "Belle Fille"

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.