Knock Out® Rose
Knock Out® Roses
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| Erica Zhou/draft | |
|---|---|
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Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Rosales |
| Family: | Rosaceae |
| Genus: | Rosa |
| Species: | R. K. Out
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| Binomial name | |
| Rosa Knock Out | |
Knock Out® Rose is an artificial hybrids and cultivars rosales. It mainly appears in garden, balcony as an ornamental plant. It has the characteristics of drought tolerance, self-cleaning, disease resistance, cold-tolerant and multiple-blooming nature[1]. Knock Out® Rose grows 3 to 5 feet tall and wide generally, suit in and widely grown from USDA Zone 5 to Zone 9[2]. Currently there are 10 kinds of Knock Out® Rose have been crossed[3].
Description
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Knock Out® Rose is a species of low-growing shrub Rosales[4]. It is hybrided by crossing two tea rose varieties, 'Carefree Beauty' and 'Razzle Dazzle' roses[5]. Knock Out® Rose be classified as a modern species roses due to it was introduced in 1999[4]. The same to normal rose, Knock Out® Rose has serrated margin leaves and flower which borne on the stem. Different from the delicate and complex care process of ordinary roses, Knock Out® Rose famous for it's easy care characteristics including self-cleaning, drought tolerance, disease resistance (such as black spot and powdery mildew) and cold tolerance[1]. However, to achieve these advantages, Knock Out® Rose sacrifice fragrance.
Accoring different varieties, Knock Out® Rose can be red, yellow, white, pink and orange. It generally can grow three to five feet tall shrub and similarly as wide. And it's rose buds usually about 3-inch large[4].
Knock Out® Rose also has a high degree of adaptability to grafting[6].
Up to 2019, the family of Knock Out® Rose have 10 members.
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| feature | scientific name | color | habit | mature size | foliage | zone* | |
|---|---|---|---|---|---|---|---|
| Knock Out® Rose | Original one | 'Radrazz’ CPBR 0,993 | Cherry red, hot pink | Bushy | On average 3–4’ h x 3–4’ w | Deep, purplish green | 5–11 |
| Double Knock Out® Rose | Full double flowers | 'Radtko’ PP 16,202 CPBR 3,104 | Cherry red | Bushy | On average 3–4’ h x 3–4’ w | Deep, purplish green | 5–11 |
| Pink Knock Out® Rose | Single petals | 'Radcon’ PP 15,070 CPBR 2,044 | Bright pink | Bushy | On average 3–4’ h x 3–4’ w | Deep, mossy green | 5–11 |
| Pink Double Knock Out® Rose | Stable and drought tolerance | 'Radtkopink’ PP 18,507 CPBR 3,757 | Pink | Bushy | On average 3–4’ h x 3–4’ w | Deep, mossy green | 5–11 |
| Blushing Knock Out® Rose | Similar to The Knock Out® Rose | 'Radyod’ PP 14,700 CPBR 2,045 | Light pink | Bushy | On average 3–4’ h x 3–4’ w | Mossy green with blue hues | 5–11 |
| Rainbow Knock Out® Rose | Color mix, compact | 'Radcor’ PP 17,346 CPBR 3,444 | Coral pink with yellow center | Bushy | On average 3–4’ h x 3–4’ w | Dark green | 4–11 |
| Sunny Knock Out® Rose | Fragrant | 'Radsunny’ PP 18,562 CPBR 4,875 | Yellow to cream | Bushy | On average 3–4’ h x 3–5’ w | Dark green, semi-glossy | 4–11 |
| Coral Knock Out® Rose | Moisture and heat resistant | 'Radral’ PP 19,803 | Brick orange fading to coral | Bushy, upright | On average 4½’ h x 4½’ w | Medium green, matte | 5–11 |
| Peachy Knock Out® Rose | Color mix | 'Radgor’ PP 25,628 | Shell pink with yellow center | Mounding | On average 3’ h x 3–4’ w | Deep green and semi-glossy | 4–11 |
| White Knock Out® Rose | Compact | 'Radwhite’ PP 20,273 | White | Compact, bushy | On average 3½’ h x 3½’ w | Very dark matte green, young foliage is almost black | 4–11 |
* Zone is point to USDA Hardiness Zone.
Distribution and habitat
editBecause of the sales area restrictions, most Knock Out® Roses be planted at the United States from zone 5 to 9, some cultivars can grow in Zone 4,10,11[4].
Knock Out® Roses have a certain demand for sun. The place that plant these roses should have at least six to eight hours sun banning every day[6].
As for soil, due to the feature of high tolerate of drought, Knock Out® Roses do not have high requirement. But moist, good air movement and well-draining soils between pH 6.0 and pH 6.5 will be more conducive to the growth of roses[4][6].
Ecology
editLife cycle
editAs an artificial ornamental cultivars, the flowering period of Knock Out® Rose is long and multiple-blooming. All kind of Knock Out® Rose can blossom through the summer months[4]. In a milder climate area (such as USDA Hardiness Zone 4-9), roses can bloom from spring to the begining of winter. In the Coastal and Tropical South, Knock Out® Rose can flowering whole year[7].
Pests and diseases
editAlthough Knock Out® Rose is known for its multiple disease resistance, it still threatened by pests and diseases.
Viruses
editRose rosette virus
editRose rosette virus (Hereinafter referred to as RRV) is a rose disease that cause and spread by small eriophyid mite[8]. It mainly appear in the East and Midwest of the United State and also parts of the South[9].
The characteristics of Rose rosette virus (Hereinafter referred to as RRV) are rapid growth of branches and severe thorn proliferation. Knock Out® Rose infected with RRV will grow small twisted leaves and redden, branches dying, plant stunting and turn severe yellow. RRV will cause roses' death within one to two years.
The cure of RRV hane not be found. Observe carefully, early identification then destroy the infected plants is the best way at the moment[8]. In the early stages of viral infection, cut the bright-red shoot clusters including connected healthy green wood can work. But once the rose buds be infected, the roots, stems, rose and all should be removed immediately[9].
Animals
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Control
editWilliam Radler created Knock Out® Roses in 1999. The fragile and difficult of taking care of odinary rose inspired him to create a kind of easier care rose. As he said“Fixing roses was one of my first goals.”
Cultivation
editKnock Out® Rose compare other roses is lower maintenance required. The self-cleaning feature let gardeners not need to worry about dead-heading as they will fall off by themselves[4].
Awards
editAll-America Rose award in 2000[13].
Comment
edit“Not everyone accepts it as being a rose.”—— Reiland of the American Rose Society[12].
See also
editReference
edit- ^ a b Salgado-Salazar, C.; Ismiael, A. A.; Crouch, J. A. (2018-02-01). "First Report of Downy Mildew of Double Knock Out Rose Caused by Peronospora sparsa in Maryland". Plant Disease. 102 (7): 1464. doi:10.1094/PDIS-11-17-1802-PDN. ISSN 0191-2917.
- ^ "How To Take Care Of Knock Out Roses". Gardening Know How. Retrieved 2019-05-11.
- ^ a b "The Family". The Knock Out® Family of Roses. Retrieved 2019-05-11.
- ^ a b c d e f g "The Genus & Species of Knock Out Roses". homeguides.sfgate.com. Retrieved 2019-05-11.
- ^ "Knock Out Roses - University of Florida, Institute of Food and Agricultural Sciences". gardeningsolutions.ifas.ufl.edu. Retrieved 2019-05-11.
- ^ a b c "Knock Out Roses - University of Florida, Institute of Food and Agricultural Sciences". gardeningsolutions.ifas.ufl.edu. Retrieved 2019-05-11.
- ^ "Pruning 'Knock Out' Rose -- When, Why, and How". Southern Living. Retrieved 2019-05-12.
- ^ a b "Rose Rosette Virus - Gardening Solutions - University of Florida, Institute of Food and Agricultural Sciences". gardeningsolutions.ifas.ufl.edu. Retrieved 2019-05-12.
- ^ a b "Is Knockout Rose Down for the Count?". Southern Living. Retrieved 2019-05-12.
- ^ Salgado-Salazar, C.; Ismiael, A. A.; Crouch, J. A. (2018-02-01). "First Report of Downy Mildew of Double Knock Out Rose Caused by Peronospora sparsa in Maryland". Plant Disease. 102 (7): 1464. doi:10.1094/PDIS-11-17-1802-PDN. ISSN 0191-2917.
- ^ a b c Alexander, Anita; Aristizabal, Luis; Arthurs, Steven (2014-02-01). "INSECTICIDE TRIAL FOR CHILLI THRIPS ON KNOCK OUT ROSE, 2013". Arthropod Management Tests. 39 (1). doi:10.4182/amt.2014.G9.
- ^ a b Frankel, Todd (July 15, 2015). "By any other name, the Knock Out rose would be just as sturdy". The Washington Post. Retrieved May 11, 2019.
- ^ "All-American Rose Selections for 2000 | Horticulture and Home Pest News". hortnews.extension.iastate.edu. Retrieved 2019-05-11.