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First created in the 1980s by independent rose breeder William Radler, the Knock Out rose became available for the public to purchase in 2000. Thanks to its vibrant colors, hardiness, and long ...
How to Plant and Care for Knock Out Roses. Like all roses, Knock Outs need full sun, which is considered 6 or more hours of direct sunlight per day.
Rosa 'Knock Out', (aka RADrazz), is a shrub rose cultivar bred by American rose grower William Radler in 1989 and introduced into the United States by Star Roses and Plants in 2000. It was named an All-America Rose Selections winner in 2000.
For beautiful summer roses in USDA Hardiness Zones 6 and lower, plants need protection during winter temperatures. Learn how to protect roses in winter.
It grows about 90 to 150 cm (3' to 5') high, [2] and 60 centimetres (2.0 ft) wide. [3] It is winter hardy up to −25 °C (USDA zone 5), but can be susceptible to mildew and black spot. The cultivar needs sunny, warm places, but can be grown in containers. [3] 'Double Delight' is used as garden rose and as cut flower. [4]
Rosa banksiae Rosa persica. There are currently four subgenera in Rosa, although there have been some disputes over the years. [3] The four subgenera are: Hulthemia (formerly Simplicifoliae, meaning "with single leaves") containing one or two species from Southwest Asia, R. persica and R. berberifolia (syn. R. persica var. berberifolia) which are the only species without compound leaves or ...