Deformed Rose Leaves: Proliferation, Viruses, or Insects?

Deformed Rose Leaves: Proliferation, Viruses, or Insects?

Three leaves joined on one petiole across multiple bushes suggests several possibilities:

• Proliferation (usually on flowers, but can affect leaves).
• Virus – typically shows color streaks/dots.
• Aphids – sucking insects distort growth.
• Cold injury to developing buds.
• Cellular disruption during leaf formation.

Proliferation Factors

High soil nitrates, genetic tendency (Gallicas, some modern roses), and specific spring weather trigger this poorly understood condition.

Reference: classicroses.co.uk