The Knock Out rose is a popular, low-maintenance shrub rose known for its continuous blooming from spring to fall and exceptional resistance to black spot disease. Introduced in 2000, it comes in various colors, including red, pink, yellow, and white, and is available in single and double-petal varieties. Knock Out roses are hardy in USDA zones 4 and warmer, thrive in full sun, and require minimal pruning, typically just a cutback in the spring to encourage new growth and blooms