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Knock Out® Roses

Knock Out® Roses are hardy shrub roses that bloom almost nonstop for 3 seasons! Because they are disease and pest resistant and self prune their spent flowers, these roses are much easier to care for than standard roses. These colorful rose bushes are heavy bloomers.

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What You Need To Know About Knock Out Roses

what is the history of the knock out rose?

What is the History of the Knock Out Rose?

After eight years of testing, this popular collection of roses was introduced in the United States by Star Roses and Plants in 2000. Knock Out Roses immediately garnered favor by winning the All American Rose Selection in 2000. They were originally bred by rosekno breeder William Radler in 1989. He created the Knock Out Rose in his basement in Wisconsin by crossing a floribunda rose with a shrub rose. Radler noted the new cultivar to be exceptional. Today, they are the top selling roses in America.

How to Care for Knock Out Roses

These hardy rose bushes are extremely low maintenance once they are established. Plant these roses in part to full sun. They will bloom best in full sun, but grow well in sites with some shade. Water when the ground is dry for the best growth and blooming. Knockout Roses adapt to any well-drained soil. Feed these roses with a balanced slow release fertilizer in early spring and late summer. Knock Out Rose bushes are recommended for hardiness growing zones 5, 6, 7, 8, 9, and 10. They are cold hardy and heat tolerant. Read more about Knock Out Rose Care

when to prune knock out roses

When to Prune Knock Out Roses?

Heavy pruning of these rose bushes should be performed when they are dormant or just starting to come out of dormancy in early spring. Dead, diseased, or broken branches should be removed immediately. Minor pruning or ‘tidying up’ can be done at any time of the year.

How to Prune Knock Out Roses

Knock Out Roses do not require pruning, but it can give you stronger, more vigorous roses, and even improve blooming. Basically, yearly pruning can afford you a prettier, cleaner looking bush. Prune back the entire rose bush to about 6 to 12 inches. Knock Out Roses are considered self-cleaning. This means the spent flowers fall off on their own so you do not need to deadhead. These roses repeat bloom on their own without human intervention! Read more on Pruning Knock Out Roses.

Knock Out Rose trees can be trimmed into a rounded shape to keep their natural lollipop habit. Never trim off the head of a rose tree.

How to Plant Knock Out Roses

Dig a hole about twice as wide and almost as deep as the root ball. Be sure that your rose plant is level and the top of the root ball is slightly above the existing soil line. Backfill the soil and water thoroughly. Apply a layer of mulch to reduce watering needs and keep weeds away. Water once daily for the first week. Keep the soil moist for the first month or two while your rose bush is establishing.

knock out roses

Knock Out Rose Bushes (Growing Zones 5 to 10)

knock out rose trees

Knock Out Rose Trees (Growing Zones 5 to 10)

  • Blushing Knock Out Rose Tree Rosa ‘Radyod’ tree form
  • Coral Knock Out Rose Tree Rosa 'Radtko' tree form
  • Double Knock Out Rose Tree Rosa 'Radral' tree form
  • Pink Knock Out Rose Tree Rosa 'Radtkopink' tree form
  • Sunny Knock Out Rose Tree Rosa 'Radsunny' tree form
  • White Knock Out Rose Tree Rosa 'Radwhite' tree form
  • Browse our online plant nursery for additional options.

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