Shrub Rose 'Knock Out'

The 'Knock Out' shrub rose revolutionized landscape roses with its exceptional disease resistance, continuous bloom cycle, and low-maintenance nature. Introduced in 1999 by hybridizer Radler (PP11836), this rose quickly became a garden staple across North America.

• Family: Rosaceae
• Genus: Rosa
• Cultivar: 'Knock Out'
• Also known as: RADrazz, Knockout, Purple Meidiland
• Hybridized by: Radler
• Introduced: 1999

Key Features: Cherry-red single to semi-double blooms (3–3.5 inches) appear in flushes from spring until frost. The glossy, dark green foliage resists black spot and powdery mildew remarkably well. Grows 3–4 feet tall and wide with a rounded, bushy habit. Thrives in full sun to partial shade, adapts to various soils, and is hardy in USDA zones 5–9 (often surviving zone 4 with protection).

Landscape Uses: Mass plantings, hedges, foundation plantings, mixed borders, and container gardens. Self-cleaning—no deadheading required. Light pruning in early spring maintains shape.