Knock Out Rose
Rosa radrazz · Deciduous Shrub, Broadleaf
Plant Family
Rosaceae
Tree Category
Ornamental Flowering Shrub
Variety / Cultivar
Radrazz (The Knock Out Rose)
Hardiness Zones
USDA Hardiness Zones 5 through 9, highly adaptable to various regional climates and temperature fluctuations.
About This Tree
A bushy, multi-stemmed deciduous shrub featuring a rounded, dense form. Known for exceptional continuous flowering throughout the warm months, vibrant green foliage, and high disease resistance, maturing into a neat, compact shrub.
Leaf Characteristics
Compound leaves with typically 5 to 7 leaflets, oval to elliptical shape, dark green and semi-glossy, finely serrated margins, alternate arrangement, turning slightly yellow in late autumn before dropping.
Bark Characteristics
Stems feature thin, greenish-brown to greyish bark with prominent, sharp thorns (prickles), turning woody and rougher at the base with age.
Growing Information
Origin Region
Cultivated garden hybrid, widely adapted across North America and Europe.
Growing Season
Perennial growing season; leafs out in early spring, flowers continuously from spring until the first heavy frost in late autumn, enters winter dormancy.
Sunlight & Water Needs
Requires full sun to partial sun (at least 6 hours of direct sunlight daily). Moderate watering needs during establishment, highly drought-tolerant once established, prefers well-draining soil.
Mature Size
Expected mature height of 3 to 4 feet (approx. 1 to 1.2 meters) with a similar spread of 3 to 4 feet. Fast growth rate, moderate lifespan of 10 to 15 years.
Special Characteristics
Remarkable disease resistance (particularly to black spot), exceptional drought and heat tolerance, continuous self-cleaning blooms requiring no deadheading, high urban pollution tolerance.
Wildlife & Ecology
Attracts pollinators such as bees and butterflies with its open blooms; provides minor nesting cover for small birds, though primarily valued as an ornamental landscape plant.