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
