Curling Leaves on Knock Out Roses: Multiple Possible Causes

Diagnosing Leaf Curl on Knock Outs

Three Knock Outs (planted last summer) now have curling leaves.

Possible Causes

• Chilli thrips (region-dependent)
• Powdery mildew onset (edges curl)
• Virus
• Sudden heat

Next Steps

Inspect leaf undersides for mites/thrips. Check for white powdery coating. Note recent weather. Without seeing plants, exact diagnosis impossible. Monitor and treat based on findings.