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All media depicts mature plants.

Double Knock Out® Rose

SHRUB

Description

  • Cherry-red flowers bloom for over five months!
  • Renown for its resistant to black spot and powdery mildew.
  • Thrives in heat and humidity; cold tolerant, too.
  • Grown on its own roots - not grafted. No special protection or fussing required.
  • Zones 5-9, sun, 4' tall x 4' wide at maturity.
Zone 5-9
Light sun
medium

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Hand-picked at our greenhouse

Shipped to your door

Arrives as young plant

background image

More Information

Description Double Knock Out® Rose (Rosa x) packs a punch with velvety, fully double, cherry-red flowers with up to 25 petals per bloom! Their sweet and spicy fragrance lightly floats through the garden. Flowers bloom for over five months, starting in early summer and persisting through frost. Let your rose do all the hard work as it self-cleans spent flowers. No maintenance required! The disease-resistant series of Knock Out® roses have taken the world by storm. Black spot, powdery mildew, and numerous other typical rose ailments won't touch these roses. Details Botanical name: Rosa x 'Radtko'
Patent #: USPP 16,202
Common name: Rose
Zone: 5 - 9
Sun exposure: Sun (> 6 hours sun)
Height x width: 3-4' x 3-4'
Flower color: Cherry-red
Foliage color: Green
Bloom season: Summer-fall
Bloom time:Summer
Features:Privacy & screening, heat tolerant, container plants, cold tolerant
Uses: Accent, Border, Container gardening, Cottage gardening, Foundation planting, Ground cover, Hedge, Massing, Ornamental, Specimen
How To Grow Soil: Prefers moist, slightly acidic, well-draining soil. Roses benefit from the addition of compost, aged manure, or leafmold to the planting soil.
Light: Sun (> 6 hours sun)
Water: Try to keep the soil evenly moist, especially in their first growing season. 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 can be done after each bloom cycle.
Winterizing: Spread a layer of composted manure, 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 injured branches over when new buds emerge in spring.
Maintenance & pruning: Prune to remove deadwood, to control or direct growth, and to promote flowering. Wait until growth breaks in early spring before pruning. Every 2 or 3 years, remove about one-third of the old branches to stimulate new, fresh growth. There is no need to remove faded flowers because these roses are self-cleaning.

Customer Reviews

Based on 6 reviews
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M
M.D. (North Carolina)
Beautiful, just like all the others

I have purchased several knockout roses from Great Garden Plants and have
been delighted with the quality, price and shipping of these plants.

P
P.H. (California)

The plant grow so fast.

M
M. (Vermont)
Roses every day on the breakfast table!

I ordered 6 of these in 2020, and they began producing blooms the first year. By year 2, the profusion of blooms was incredible. I highly recommend these for zones 5 and above. Unfortunately I lost 2 this winter, so not hardy enough for zone 4, despite my efforts to insulate them from the cold..

S
S.M. (Tennessee)
Double knock out rose

The plant has adjusted well. It has grown quickly and has produced several buds.

J
J. (Virginia)
Healthy plants

Happy, healthy plants. Always packaged perfectly. Growing really well. Can’t wait for them to fill out.