Special Gift Offer

Double Knock Out rose

By: Garden Gate staff
Double Knock Out could be the perfect landscape rose.

Knock Out rose

plant pick

Double Knock Out® rose Rosa ‘RADtko’

Double Knock Out could be the perfect landscape rose. These 3 1/2-in., double fluorescent cherry-red flowers bloom from late spring to frost and never need deadheading. And like its cousin, the original Knock Out, this rose is drought-tolerant, self-cleaning and won’t succumb to blackspot.

With its hint of spicy scent, Double Knock Out is about as maintenance-free as it could be. It’s almost constantly covered in blooms — about five flowers in a cluster and 25 clusters on each branch. In fall the foliage turns rich purple with subtle maroon undertones.

TYPE Perennial SIZE 36 in. tall and wide BLOOM Cherry-red from late spring to frost LIGHT Full sun SOIL Moist, well-drained PESTS None serious HARDINESS Cold: USDA zones 4 to 9; Heat: AHS zones 9 to 1

Published: Jan. 27, 2009
  • None
GDT Ad_PhoneCases_zone5

Product Recommendations

Here are some supplies and tools we find essential in our everyday work in the garden. We may receive a commission from sales referred by our links; however, we have carefully selected these products for their usefulness and quality.


Also in This Newsletter

Garden Gate

Last Week’s Newsletter

January 20, 2009

Using balance in design

As one of the principles of design, balance is one of the building blocks of a beautiful garden.

Spider mites

You’ll probably notice the symptoms long before you see the actual pest.