Knock Out

Bred by William Radler (USA) and an AARS winner in 2000, 'Knock Out' is a revolutionary landscape rose that fundamentally changed expectations for low-maintenance roses. Cherry-red semi-double blooms appear continuously from spring until frost without the need for deadheading — the plant drops its own spent flowers in a self-cleaning habit unique among roses. Resistance to black spot is exceptional; the plant thrives with essentially no chemical spraying even in high-disease-pressure climates. Tolerant of both heat and cold, it has achieved extraordinary adoption across diverse climate zones. At 0.9–1.2m, it is compact enough for most garden situations and requires only a single spring shearing to one-third of its height for annual maintenance. It is widely credited with bringing rose gardening to a new audience of low-maintenance gardeners.

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