PlantFiles: Grandiflora Rose Rosa 'Scarlet Knight'
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Hardiness: USDA Zone 7a: to -17.7 °C (0 °F) USDA Zone 7b: to -14.9 °C (5 °F) USDA Zone 8a: to -12.2 °C (10 °F) USDA Zone 8b: to -9.4 °C (15 °F) USDA Zone 9a: to -6.6 °C (20 °F) USDA Zone 9b: to -3.8 °C (25 °F) USDA Zone 10a: to -1.1 °C (30 °F) USDA Zone 10b: to 1.7 °C (35 °F) USDA Zone 11: above 4.5 °C (40 °F)
Propagation Methods: From herbaceous stem cuttings From woody stem cuttings From softwood cuttings From semi-hardwood cuttings From hardwood cuttings By grafting By budding By simple layering By air layering By tip layering
ATL - 7B. I bought this plant bare root from a big box retailer, and I have to say that while the blooms are beautiful, red with a blue tint, they have not fared well here in our full sun large container garden. The black spot, the aphids, the japanese beetles have all taken their toll, and they usually look, honestly, absolutely dreadful. My husband and I try to garden using environmentally-gentle methods, and despite weekly neem oil treatments and a nearby beetle bag this rose has consistently looked more dead than alive.
I purchased two at the same time, and decided to plant the second one at our community garden, where it received even less care than here at home. It appeared to die off in the fall from the accumulated neglect, but now that the bugs are gone it is suddenly putting out fresh new leaves at the base. Honestly I don't know what to do with them at this point.
On May 9, 2009, Leehallfae from Seattle, WA wrote:
Scarlet Knight: Spacing, about 18 to 30 inches apart. Average size is 4 feet by 4 feet, and cold hardiness is -10F to -20F. Plant in full sun, where it will receive at least 6 hours of direct sunlight Daylight Savings Time.