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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.
While not every Knock Out rose has a scent, there are two varieties that smell just as good as they look: Sunny Knock Out and White Knock Out, which were introduced in 2006 and 2018 respectively.
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 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 ...
It was verified as Rosa roxburghii by United States Department of Agriculture and the Agricultural Research Service on 15 February 1996, [15] and is listed as Rosa roxburghii in the Encyclopedia of Life. [18] Rosa roxburghii f. normalis is an accepted name by the RHS and listed in the RHS Plant Finder book. [20]
It is native to eastern Asia, in China, Japan, and Korea. It should not be confused with Rosa rugosa, which is also known as "Japanese rose", or with polyantha roses which are garden cultivars derived from hybrids of R. multiflora. It was introduced to North America, where it is regarded as an invasive species.
For example, Cotoneaster contains between 70 and 300 species, Rosa around 100 (including the taxonomically complex dog roses), Sorbus 100 to 200 species, Crataegus between 200 and 1,000, Alchemilla around 300 species, Potentilla roughly 500, and Rubus hundreds, or possibly even thousands of species.
Rosa balsamica Besser – Romania, scattered places in the Western Balkans, uncertain in Greece; Europe and the Caucasus. [20] Rosa abietina Gren. ex Christ – the Istria peninsula in Croatia; the Alps. [21] Rosa tomentosa Sm. – throughout the Balkans except all but the northernmost parts of Greece; Europe, Anatolia and the Caucasus. [22]