Patty is concerned about the color of her knock out rose canes and leaves.
She writes: I have beautiful Knockout Roses. They are two years old. They are planted twenty feet apart.
I lost one last year and in the same spot this year I lost the second. Now this summer the other group is showing the same signs.
Dense formation of prickles on the canes and stems. Canes and leaves are deep red and purple in color.
Is there any way to save the rest? The tea roses in the same bed are not affected. Thanks so much!
the dense formation of prickles along the canes and stems is nothing to worry about, as that is typical of a knocout rose bush.
Also the description of the canes and leaves being a deep red and purple color sounds like it is just putting on new growth.
As you can see from the picture at the top left of this article, the purpley-red new growth (where I have white arrows pointing) is typical of the color of the new growth of knockout roses. Actually it is a good sign that the plant is growing.
I don’t know what could have caused the death of your other knock out rose last year, but I would inspect your knockouts on a regular basis to be on the lookout for any sign of pest or disease problems that may have contibuted to that other rose’s death.
Knockout roses are hardy roses and aren’t troubled by the usual rose disease problems, but to be on the safe side and control any future problems with your other knockouts, just be vigilant with checking them over when you’re watering them. That way you can be on top of any problems before they get a hold of your rose plants.