Knockout Red Rose Rosa hybrida 'Radrazz' PP #11836
Other Common Name(s):
- Phonetic Spelling
- RO-zuh hy-BRID-uh
- Description
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For years, disease-resistant roses have been on the market, only to disappoint Southern gardeners. Now you’ll need to look no further.
The Knockout Red Rose has found its place in the hearts of American gardeners. Unlike its predecessors, Knockout Red has the grit to withstand our hot, humid weather.
This exciting rose cultivar is a shrub rose that usually grows about 3 feet tall and wide. As the weather warms, 3-inch diameter, cherry-red blooms appear as terminal clusters of single flowers. The flowers have a mild tea rose fragrance and are attractive to butterflies. As long as the plants continue to grow through spring, summer, and fall, this rose will continue to flower.
Like nearly all roses, Knockout Red Rose performs best in full sun with fertile, well-drained slightly acidic soil but it will withstand partial shade and is one of the few roses that will bloom in partial shade. Prune during the growing season on an “as needed” basis to manage plant size though they require less pruning than most roses. Water during periods of drought to maintain a continual supply of flowers and be sure to mulch the roots well to maintain moisture and consistent soil temperatures. Use this plant as a specimen, in the back of a border, planted in small groups, or as a hedge in a cottage or sensory garden.
Chosen in 2000 as an All-America Rose Award winner, this plant is truly a knockout!
Insects, Diseases, and Other Plant Problems: Roses are susceptible to many diseases though this cultivar is more resistant than others. Keeping good air circulation around the plant and avoiding overhead watering is critical to reduction of foliar diseases. It is susceptible to rose rosette which is a witches broom caused by a virus that is spread through mites. It can quickly spread to other roses in the surrounding area and the only treatment is the removal of infected plants.
VIDEO Created by Elizabeth Meyer for "Trees, Shrubs and Conifers" a plant identification course offered in partnership with Longwood Gardens.
- Profile Video:
- See this plant in the following landscape:
- Flower Bonanza Garden
- Cultivars / Varieties:
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- 'Double Red'
- ‘Radrazz’
- 'Double Red'
- 'Double Red', ‘Radrazz’
- Tags:
- Cultivars / Varieties:
-
- 'Double Red'
- ‘Radrazz’
- 'Double Red'
- 'Double Red', ‘Radrazz’
- Tags:
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Attributes:
- Genus:
- Rosa
- Species:
- hybrida
- Family:
- Rosaceae
- Uses (Ethnobotany):
- The fruit of rose, the rose hip, is high in vitamin C and has been used in folk medicine for stomach pain and to treat cancer.
- Life Cycle:
- Woody
- Wildlife Value:
- Butterflies are attracted to the flowers.
- Particularly Resistant To (Insects/Diseases/Other Problems):
- Diseases like black spot.
- Dimensions:
- Height: 3 ft. 0 in. - 10 ft. 0 in.
- Width: 3 ft. 0 in. - 10 ft. 0 in.
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Whole Plant Traits:
- Plant Type:
- Rose
- Shrub
- Woody Plant Leaf Characteristics:
- Deciduous
- Habit/Form:
- Erect
- Growth Rate:
- Rapid
- Maintenance:
- Medium
- Texture:
- Coarse
- Appendage:
- Prickles
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Cultural Conditions:
- Light:
- Full sun (6 or more hours of direct sunlight a day)
- Partial Shade (Direct sunlight only part of the day, 2-6 hours)
- Soil Texture:
- Loam (Silt)
- Soil pH:
- Acid (<6.0)
- Neutral (6.0-8.0)
- Soil Drainage:
- Good Drainage
- Moist
- Available Space To Plant:
- 3 feet-6 feet
- USDA Plant Hardiness Zone:
- 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b
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Fruit:
- Fruit Color:
- Orange
- Red/Burgundy
- Display/Harvest Time:
- Fall
- Fruit Description:
- Orange-red rose hip
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Flowers:
- Flower Color:
- Gold/Yellow
- Flower Value To Gardener:
- Fragrant
- Good Cut
- Long Bloom Season
- Showy
- Flower Bloom Time:
- Fall
- Spring
- Summer
- Flower Petals:
- 7 - 20 petals/rays
- Flower Size:
- 3-6 inches
- Flower Description:
- 3-inch diameter, cherry-red blooms appear as terminal clusters of single 3.5" flowers with 7+ petals on single or sometimes double flowers. Blooms appear from spring, through summer, and until the first frost of fall. Buds are ovoids and pointed.
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Leaves:
- Woody Plant Leaf Characteristics:
- Deciduous
- Leaf Color:
- Green
- Purple/Lavender
- Deciduous Leaf Fall Color:
- Purple/Lavender
- Red/Burgundy
- Leaf Type:
- Compound (Pinnately , Bipinnately, Palmately)
- Leaf Arrangement:
- Alternate
- Leaf Margin:
- Dentate
- Hairs Present:
- No
- Leaf Description:
- Dark purple green leaves with 5-7 leaflets with toothed margins. Leaves turn burgandy-violet in the fall.
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Stem:
- Stem Color:
- Green
- Stem Is Aromatic:
- No
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Landscape:
- Landscape Theme:
- Cottage Garden
- Cutting Garden
- Garden for the Blind
- Pollinator Garden
- Design Feature:
- Border
- Foundation Planting
- Hedge
- Small groups
- Attracts:
- Butterflies
- Resistance To Challenges:
- Diseases
- Heat
- Humidity
- Problems:
- Spines/Thorns
- Weedy
