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Family: Rosaceae (ro-ZAY-see-ee) (Info) Genus: Rosa (RO-zuh) (Info) Cultivar: Rainbow Knockout Additional cultivar information: (PP17346, aka Radcor, Rainbow Knock Out) Hybridized by Radler; Year of Registration or Introduction: 2005
Hardiness: USDA Zone 4a: to -34.4 °C (-30 °F) USDA Zone 4b: to -31.6 °C (-25 °F) USDA Zone 5a: to -28.8 °C (-20 °F) USDA Zone 5b: to -26.1 °C (-15 °F) USDA Zone 6a: to -23.3 °C (-10 °F) USDA Zone 6b: to -20.5 °C (-5 °F) USDA Zone 7a: to -17.7 °C (0 °F) USDA Zone 7b: to -14.9 °C (5 °F) USDA Zone 8a: to -12.2 °C (10 °F) USDA Zone 8b: to -9.4 °C (15 °F) USDA Zone 9a: to -6.6 °C (20 °F) USDA Zone 9b: to -3.8 °C (25 °F)
Bloom Color: Apricot and apricot blend (ab) Light pink (lp)
Bloom Shape: Single
Flower Fragrance: No fragrance
Bloom Time: Late Spring/Early Summer Mid Summer Late Summer/Early Fall Mid Fall Blooms repeatedly
Habit: Shrub
Patent Information: Patented
Other Details: Resistant to black spot Resistant to rust Sets hips
Pruning Instructions: Blooms on new wood; prune early to promote new growth
Soil pH requirements: 5.6 to 6.0 (acidic) 6.1 to 6.5 (mildly acidic)
Propagation Methods: From softwood cuttings From semi-hardwood cuttings From hardwood cuttings By grafting By budding
On Apr 20, 2012, paddleaddict from Chesapeake, VA wrote:
There are 14 rainbow knock-out roses lining the front of my southwest facing beds that stay covered with powdery mildew from early spring to first frost. I live in zone 8. They receive no overhead irrigation and are growing in full sun conditions. They have excellent air movement and only late afternoon shade. Other knock-outs nearby are stellar. The rainbows have been established now for about 8 years, and receive routine maintenance. Both my husband and I are professionals in horticulture, but cannot get any solid reasons for their continuing condition. We have 'many' other varieties of roses throughout our yard that are amazing. The rainbows flower wonderfully, but like I said are plagued with powdery mildew. We are not eager to nuke them as we've created a song bird 'sanctuary' and hope to keep it pristine. Any ideas?
On Apr 1, 2012, Sandwichkatexan from Copperas Cove, TX wrote:
I have these planted in heavy shade and they still bloom like crazy . In my area they have no blackspot or mildew and they have beautiful hips in the winter . One of the few roses that will heavily bloom in shade .
On Oct 29, 2008, dovey from Columbus, OH (Zone 5b) wrote:
I like Rainbow Knockout, of all the knockout roses it's the prettiest. It makes a great choice for a tree rose.
It seems to enjoy a dryer climate over an area with high humidity.
On Jun 2, 2008, jetgirl from Alexandria, VA wrote:
I saw the Rainbow Knock Out rose at a nursery today, and the plants had significant MILDEW on the new growth (top 6", leaves and buds). The nursery is on a ridge with good air movement and all day sun. I think the supplier was Star Roses.
On Feb 9, 2007, mystic from Ewing, KY (Zone 6a) wrote:
2007 AARS (All-American Rose Selection) winner.
Regional...
This plant has been said to grow in the following regions:
Williford, Arkansas Forest Falls, California San Jose, California Old Jefferson, Louisiana Minneapolis, Minnesota Concord, North Carolina Columbus, Ohio Knoxville, Tennessee Copperas Cove, Texas Richmond, Texas Groveton, Virginia
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