| Rosa'Knock Out' | |
|---|---|
 Rosa 'Knock Out' | |
| Genus | Rosa hybrid |
| Hybrid parentage | 'RAD85-139.1' x 'RAD84-196.8' |
| Cultivar group | Shrub Rose |
| Cultivar | RADrazz |
| Marketing names | 'Knock Out' , 'Purple Meidiland' |
| Origin | United States, 1989 |
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.
'Knock Out' was developed by amateur rose breeder William Radler in his Milwaukee, Wisconsin basement in 1989. The cultivar was developed from a cross between two unpatented, unnamed seedlings bred by Radler himself. The seed parent, with code RAD85-139.1, came from the open pollination of a seedling with parentage {Carefree beauty x [(Tampico x Applejack) x Playboy]} x {Carefree beauty x [(Tampico x Applejack) x Playboy]}. The pollen parent, code RAD84-196.8, had as parentage Razzle Dazzle x [Deep purple x (Fabergé x Eddie's Crimson)] Compared to the other new hybrid rose plants in his backyard test garden that year, Radler recalled that new cultivar was exceptional. "The rose was special, a dense bush full of pinkish-red blooms. No need to prune. Dead flowers just fell off. No need to spray. The rose appeared immune to diseases such as black spot mildew". [1]
"'Many people consider 'Knock Out' a good example of the type of rose that will be most popular in the future. It is a landscaping or shrub rose in the Floribunda style, but totally disease-free, drought-tolerant, extremely hardy and amazingly floriferous."
— Quest-Ritson, 2011. [2]
Radler was able to work with the wholesale nursery, Star Roses and Plants, to help develop and test the new rose cultivar. After eight years of testing, Star Roses introduced the new rose into the United States in 2000 under the marketing name of 'Knock Out'. The extremely hardy rose cultivar was successful that first year, and has become one of America's top selling roses. 'Knock Out' is also the original rose variety of a large family of 'Knock Out rose varieties. [1]
'Knock Out' is a medium, bushy shrub, 2 to 4 ft (60—121 cm) in height with a 3 to 4 ft (90—120 cm) spread. Blooms are 2—3 in (5—7 cm) in diameter, saucer-shaped, with single to semi-double (5—13) petals. [3] Flowers open from attractive buds, and are a bright cherry red with a white center and green-yellow stamens. [2] Flowers have a strong, fruity fragrance, and bloom in flushes from spring through fall. 'Knock Out' is disease resistant and black spot resistant, but is susceptible to mildew. The shrub has glossy, dark green foliage. New stems and growth are purple. The plant thrives in USDA zones 4 and warmer. [4]
Rosa 'Mister Lincoln', also known as 'Mr. Lincoln', is a dark red hybrid tea rose cultivar. Bred by Herbert Swim and Weeks Rose Growers in 1964, the rose was named an All-America Rose Selections winner in 1965.
Rosa 'Sun Flare',, is a yellow floribunda rose cultivar, bred by William Warriner and introduced into United States by Jackson & Perkins in 1981. The rose won a gold medal in Japan in 1981, Portland in 1982 and was named an All-America Rose Selections winner in 1983.
Rosa 'Europeana' is a dark red Floribunda rose cultivar. It was created by de Ruiter Innovations in Belgium in 1963. It was named an All-America Rose Selections in 1968.
Rosa 'Gene Boerner' is a pink Floribunda rose cultivar, bred by Eugene Boerner and introduced into the United States by Jackson & Perkins in 1968, in honor of Boerner. The cultivar was named an All-America Rose Selections winner in 1969.
Rosa 'Voodoo',, is a hybrid tea rose cultivar, bred by Jack Christensen in 1984. The rose variety was created from the stock parents: grandiflora 'Camelot'; hybrid tea, 'First Prize'; hybrid tea, 'Typhoo Tea'; and hybrid tea, 'Lolita'. The cultivar was named an All-America Rose Selections winner in 1986.
Rosa 'Bonica 82',, is a shrub rose cultivar, bred by Marie-Louise Meilland in France in 1982. The cultivar was named an All-America Rose Selections winner in 1987.
Rosa 'Tournament of Roses',, is a grandiflora rose cultivar, bred by William Warriner, and introduced into the United States by Jackson & Perkins in 1988. The rose was named for the Tournament of Roses flower festival and parade held annually in Pasadena, California. The cultivar was named an All-America Rose Selections winner in 1989.
Rosa 'Queen Elizabeth' is a pink Grandiflora rose cultivar, bred by rose grower, Dr. Walter Lammerts in the United States in 1954. The rose variety is very popular worldwide and has won numerous awards, including "World's Favorite Rose", (1979).
Rosa 'Carefree Wonder',, is a shrub rose cultivar, bred by Allain Melland, of Meillaind rose growers, in France in 1990. The rose was named an All-America Rose Selections winner in 1991.
Rosa 'Secret',, is a pink and white hybrid tea rose cultivar, bred before 1992 by Daniel Tracy. The new rose variety was introduced into the United States by Star Roses in 1994. The rose was named an All-America Rose Selections winner in 1994.
Rosa 'Spek's Centennial',, is a floribunda rose cultivar, bred by Sam McGredy IV. It was introduced into New Zealand by Egmont Roses in 1991. The rose cultivar was later introduced into the United States by Edmunds' Roses in 1994 as 'Singin' in the Rain'. The rose was named an All-America Rose Selections winner in 1995.
Rosa 'Livin' Easy',, is a floribunda rose cultivar, bred by Jack Harkness. It was introduced into the United States by Weeks Roses in 1992 as 'Fellowship'. The rose was named an All-America Rose Selections winner in 1996.
Rosa 'Betty Boop',, is a floribunda rose cultivar bred by American hybridizer, and introduced into the United States by Weeks Roses in 1999. 'Betty Boop' was named an All-America Rose Selections winner in 1999.
Rosa 'Glowing Peace',, is an orange and yellow Grandiflora rose cultivar, developed by Michèle Meilland Richardier before 1998. The cultivar was introduced into France as 'Phillipe Noiret', and into the United States by Star Roses and Plants as 'Glowing Peace'. The rose was named an All-America Rose Selections winner in 2001.
Rosa 'Love & Peace',, is a hybrid tea rose cultivar bred in the United States by Ping Lim and Jerry Twomey in 1991. The rose was named an All-America Rose Selections winner in 2002.
Rosa 'Apricot Nectar' is a hybrid tea rose cultivar, bred by Eugene Boerner before 1964. The plant is considered very easy to grow and is well known for its attractive pale apricot pink color. It was named an All-America Rose Selections (AARS) winner in 1966.
Rosa 'Miss All-American Beauty',, is a hybrid tea rose cultivar, developed by Marie-Louise Meilland in 1965. The cultivar was the recipient of the Portland Gold Medal in 1966 and named an All-America Rose Selections winner in 1968.
Rosa 'Honor',, is a white blend hybrid tea rose cultivar, developed by William Warriner, and introduced into the United States by Jackson & Perkins in 1980. The cultivar was the recipient of the Portland Gold Medal in 1978 and was an All-America Rose Selections winner in 1980.
Rosa 'Love',, is a grandiflora rose cultivar, developed by William Warriner, and introduced into the United States by Jackson & Perkins in 1980. The cultivar was the recipient of the Portland Gold Medal and was named an All-America Rose Selections winner in 1980.
Rosa 'Just Joey',, is an apricot blend hybrid tea rose cultivar, bred by Roger Pawsey and named in honor of his wife, Joey. The plant was introduced into the United Kingdom by Cants of Colchester rose growers in 1972. 'Just Joey' was inducted into the Rose Hall of Fame as "World's Favourite Rose" in 1994.
