If existing Knock Out roses look healthy, there's no need to avoid adding more. Rose rosette virus spreads via mites, not soil or water. Without infected plants nearby, new roses will thrive. Inspect new purchases for excessive thorns and reddish stem discoloration—common symptoms of infection.
New Knockout Rose Leaves Curling: Mildew or Fertilizer Burn?
Reviving Stressed Knockout Roses After Transplant and Drought
Rose Rosette Disease: Identification and Management
Finding Disease-Resistant Yellow Roses for Coastal Washington Gardens
Knock Out Rose Decline: Investigating Sudden Browning in Kansas City
Rose Rosette Disease: Why Knock Out Roses Aren't the Only Victims
Balsam Fir Needlecast: Safe to Replant Balsams After Removal
Fungal Leaf Spots on Basil in Colombia
Post-Storm Knock Out Roses: Mulch Fungus, Transplant Shock & Recovery
Yellow Leaves on Winter Roses in Namibia—Not a Virus
Knock Out Rose Leaves: White Spots → Holes = Shot Hole Fungus
Knockout Roses and Rose Rosette Disease: No Special Resistance
Breaking the Spray Cycle: Choosing Disease-Resistant Roses and Cultural Controls
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