Rose Double Knock Out® Description
KnockOut roses have proven their value to American gardeners with their disease resistant foliage & heavy flower show.
Rose Double Knock Out takes the flowers a step further with large 2-3" velvety red, fully double flowers with up to 25 petals per bloom! Flowering begins in early summer & continues until the killing fall frosts.
There is no need to deadhead Double Knock Out--the flowers will continue no matter what!
This colorful and disease resistant new hybrid of Knock Out rose is destined to find homes in many garden designs, and also compliments any container garden display on the patio or terrace!
Perfect Long-blooming hedge plant and great companion to fragrant coneflowers, ornamental grasses, and thuja Green Giant.
The disease resistant series of Knock Out roses have taken the world by storm. Their ability to bloom continuously from late spring through fall while maintaining disease-free foliage has led to a resurgence in rose growing!
Blackspot, powdery mildew, and numerous other typical rose ailments don't touch this delightful series of roses! These amazing landscape rose bushes give over 6 months of bloom, and are even self cleaning (no more deadheading)!
Special features: Blooms first year, Cold hardy, Disease resistant, Easy care, Fast growing, Heat tolerant, Long blooming, Multi-seasonal interest, Reblooming, Season extender
Recommended For You:
- Botanical name:
Rose Double Knockout 'Radtko'
- Common name:
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- Height x width:
3' x 3'
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Accent, Border, Container gardening, Cottage gardening, Foundation planting, Ground cover, Hedge, Massing, Ornamental, Specimen
- Cannot ship to:
- Patent #: 16,202
More Info, How-To's, Videos and more
Soil: Prefers medium moisture, slightly acidic, well-drained garden loam. Roses benefit from the addition of compost, aged manure, or leafmold to the planting soil.
Light: At least 5-6 hours of direct sun per day is preferred, though this variety will grow very well in part shade locations with excellent disease resistance.
Water: One inch of water per week throughout their first growing season. A generous layer of organic mulch (compost or composted manure) helps keep the soil evenly moist. If weather is dry in the fall, be sure to water Roses well. Never allow the foliage to remain wet into the evening; water early in the day.
Spacing: 3 - 4 ft.
Fertilizing: To keep the flowers coming, feed your roses with a fertilizer blended especially for roses. This should be done after each bloom cycle.
Winterizing: If you live near a rose's cold limit, and you garden on an exposed site or in an area where rapid temperature fluctuations are common, you should mound two shovelfuls of composted manure, garden soil, compost, or shredded leaves over the base of the plant in late fall after the ground freezes. Covering these mounds and the lower parts of the bushes with evergreen boughs will add protection. Pull the mounding material away from the stem as new growth emerges in spring. Prune branches injured over winter when new buds emerge in spring.
Maintenance & pruning: Cleaning up old foliage is important for disease control. Prune to remove deadwood, to control or direct growth, and to promote flowering. Wait until growth breaks from the canes in early spring before pruning. Every 2 or 3 years remove about one third of the old branches to stimulate new, fresh growth. If you are trying to keep the roses at a certain height, you can cut them back hard with hedge shears. No need to worry about usual rose pruning rule of cutting back to an outward facing leaf bud; just lop them down to the desired size. There is no need to remove faded flowers because these roses are self cleaning.
ReviewsWrite a reviewBeautiful Roses!Debra A | May 25, 2014Received our ordered roses today. Could not believe how wonderfully secure they were shipped. Arrived without any damage to plants/boxes. Thank you. You have a new customer. Keep up the great work.
Wonderful Roses!Sharon S | May 15, 2014I just wanted to contact you and let you know that my roses were received in great shape - your packing was tremendous. The roses are now in their new bed and blooming profusely.