Shrub Rose - Knockout
Rosa 'Radrazz'
America's most popular landscape rose revolutionized home gardening with its incredible disease resistance and non-stop blooming performance. These cherry-red flowers appear continuously from spring until hard frost without deadheading, while the compact, rounded habit fits perfectly into mixed borders and foundation plantings. Virtually maintenance-free, it's the perfect choice for gardeners wanting beautiful roses without the fuss.
Sun
White-Tailed Deer
Zones
5–11
USDA hardiness
Height
1-8 feet
Planting Timeline
Showing dates for Shrub Rose - Knockout in USDA Zone 7
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Shrub Rose - Knockout · Zones 5–11
Growing Details
Zone-by-Zone Planting Calendar
Complete Growing Guide
Light: White-Tailed Deer, Cottontail Rabbit. Soil: Clay, Loam (Silt). Soil pH: Acid (<6.0), Neutral (6.0-8.0). Height: 1 ft. 0 in. - 8 ft. 0 in.. Spread: 1 ft. 0 in. - 6 ft. 0 in.. Spacing: Less than 12 inches, 12 inches-3 feet, 3 feet-6 feet, 6-feet-12 feet. Growth rate: Medium. Propagation: Grafting.
Harvesting
The accessory fruit is called a hip and forms after the flowers finish blooming. The hip will appear under the sepals of where the flower was after the flower dies. They will turn from green to red. They are filled with many achenes surrounded by irritating hairs.
Color: Green, Red/Burgundy. Type: Achene. Length: < 1 inch. Width: < 1 inch.
Garden value: Showy
Harvest time: Fall
Bloom time: Summer
Edibility: The fruit (called the hip) is edible.
History & Origin
Origin: Temp. & Subtropical Northern Hemisphere (such as Europe & Asia)
Advantages
- +Disease resistance: #showy flowers#fragrant flowers#heat tolerant#rose#tsc#cottage garden#security plant#high maintenance#English garden#cutting garden#border back#tsc-s#bee friendly#container plant#patio#hedge#prickles#shrub rose#cpp#walkway#HS111#HS303#hortcontest#nesting site#fpp
- +Wildlife value: Wildlife is attracted to the edible hips. Single-flowered species and cultivars are attractive to bees. Dead stems are used by stem-nesting bees.
- +Edible: The fruit (called the hip) is edible.
Companion Plants
Plant Together
Lavender
Repels aphids, spider mites, and other rose pests while attracting beneficial pollinators
Marigold
Deters nematodes, aphids, and whiteflies while adding vibrant color contrast
Garlic
Natural fungicide properties help prevent black spot and powdery mildew on roses
Catmint
Repels aphids and ants while attracting beneficial insects and providing drought tolerance
Allium
Strong scent deters aphids, thrips, and Japanese beetles from attacking roses
Clematis
Shares similar growing conditions and provides vertical interest without competing for nutrients
Salvia
Attracts beneficial insects and hummingbirds while providing complementary flower colors
Rosemary
Repels various insects and provides aromatic foliage with similar sun requirements
Keep Apart
Black Walnut Tree
Releases juglone toxin which inhibits rose growth and can cause wilting
Large Trees
Compete for water, nutrients, and sunlight, creating poor air circulation around roses
Brassicas
Heavy feeders that compete for nutrients and may attract pests that also target roses
Pests & Disease Resistance
Resistance
Outstanding resistance to black spot, powdery mildew, and rust
Common Pests
Occasionally aphids or Japanese beetles
Diseases
Extremely disease resistant, rarely affected by common rose diseases