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Verbena canadensis Verbena canadensis
Dianthus barbatus Dianthus barbatus
Rosa hybrida 'Radrazz' PP #11836 has some common insect problems:
Roses for North Carolina
Rose Pest Management Calendar
Pests of Rose

Knock Out Rosa hybrida 'Radrazz' PP #11836

Phonetic Spelling
RO-zuh hy-BRID-uh
Description

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.

 

More information on Rosa.

Profile Video:
See this plant in the following landscape:
Flower Bonanza Garden
Cultivars / Varieties:
  • 'Double Red'
  • ‘Radrazz’
'Double Red', ‘Radrazz’
Tags:
#showy flowers#fragrant flowers#heat tolerant#drought tolerant#fall flowers#specimen#red flowers#cut flowers#spring flowers#fall interest#show stopper#cottage garden#hedges#cpp#summer flowers#borders#cutting garden#border back#humidity tolerant#fall color red#fall color purple#small groups
 
Cultivars / Varieties:
  • 'Double Red'
  • ‘Radrazz’
'Double Red', ‘Radrazz’
Tags:
#showy flowers#fragrant flowers#heat tolerant#drought tolerant#fall flowers#specimen#red flowers#cut flowers#spring flowers#fall interest#show stopper#cottage garden#hedges#cpp#summer flowers#borders#cutting garden#border back#humidity tolerant#fall color red#fall color purple#small groups
  • 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.
  • Whole Plant Traits:
    Plant Type:
    Rose
    Shrub
    Woody Plant Leaf Characteristics:
    Deciduous
    Habit/Form:
    Erect
    Growth Rate:
    Rapid
    Maintenance:
    Medium
    Texture:
    Coarse
    Appendage:
    Prickles
  • 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, 6b, 6a, 7a, 7b, 8a, 8b, 9b, 9a
  • Fruit:
    Fruit Color:
    Orange
    Red/Burgundy
    Display/Harvest Time:
    Fall
    Fruit Description:
    Orange-red rose hip
  • 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.
  • 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.
  • Stem:
    Stem Color:
    Green
    Stem Is Aromatic:
    No
  • 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