![]() ![]() ![]() The plant thrives in USDA zone, 4 and warmer. The shrub has glossy, dark green foliage. 'Knock Out' is disease resistant and blackspot resistant, but is susceptible to mildew. Stop fertilizing a month before your first frost date. Flowers have a strong, fruity fragrance, and bloom in flushes from spring through fall. Mature Knock Out roses will benefit from a general purpose or rose fertilizer applied regularly during the growing season. Flowers open from attractive buds, and are a bright cherry red with a white center and green-yellow-stamens. Blooms are 2-3 in (5-7 cm) in diameter, saucer-shaped, with single to semi-double (5-13) petals. These are some of the more common diseases the home gardener may encounter. '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. 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. After eight years of testing, Star Roses introduced the new rose into the United States in 2000 under the marketing name of 'Knock Out'. Radler was able to work with the wholesale nursery, Star Roses and plants, to help develop and test the new rose cultivar. It is a landscaping or shrub rose in the Floribunda style, but totally disease-free, drought-tolerant, extremely hardy and amazingly floriferous." "'Many people consider 'Knock Out' a good example of the type of rose that will be most popular in the future. The rose appeared immune to diseases such as black spot mildew". "The rose was special, a dense bush full of pinkish-red blooms. The pollen parent, code RAD84-196.8, had as parentage Razzle Dazzle x Compared to the other new hybrid rose plants in his backyard test garden that year, Radler recalled that new cultivar was exceptional. These roses should be planted in the spring or early fall for the best results. The seed parent, with code RAD85-139.1, came from the open pollination of a seedling with parentage. ![]() The cultivar was developed from a cross between two unpatented, unnamed seedlings bred by Radler himself. 'Knock Out' was developed by amateur rose breeder, William Radler in his Milwaukee, Wisconsin basement in 1989. It was named an All-America Rose Selections winner in 2000. However, for best performance, cut back every year in early spring after the last threat of frost has passed.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. This shrub rose does not require special care.Total blackspot resistance makes this shrub a truly disease-free landscape rose.May be planted in large groups to create a colorful hedge or along a foundation to provide a bright border. An excellent choice for beds, and borders where it can be planted among shrubs, annuals, and perennials. The original Knock Out® was introduced 20 years ago and forever changed the way we think about roses.This rose is noted for its ability to bloom in as little as 3 hours per day of direct sun with excellent disease resistance. Best grown in full sun or partial sun, in rich, fertile with adequate moisture, well-drained soils.Grows in a rounded, bushy and well-behaved shrub, up to 3-4 ft.Winner of the 2000 All-America Rose Selection - the most prestigious rose award in the USA, and the Cary Award which recognizes plants that are particularly adequate for New England, offer superior landscape appeal, are winter hardy and pest resistant.Rosa Knock Out® belongs to the Knock Out® shrub roses which are known for their compact size, long bloom season, bright colors, profuse flowering, exceptional resistance to black spot, and winter hardiness. Easy to grow, low maintenance, drought tolerant, and self-cleaning, this immensely popular shrub rose is an exceptional choice for the landscape and suits every garden and lifestyle. The foliage turns purple to burgundy in fall. Blooming continuously from spring until frost, the flowers are followed by decorative orange-red hips. The blossoms do not fade in the heat and stand out against the disease-resistant, dark purplish-green foliage. across (9 cm), adorned with up to 11 petals. Blooming its heart out, Rosa Knock Out® is a compact shrub rose which produces abundant clusters of single to semi-double, vibrant cherry-red flowers, up to 3.5 in. ![]()
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