Why Do Leaves on Rose Bushes Turn Red?
Direct Answer • Key Takeaway
This Could Be the Result of Virus Infection, but a Much More Common Cause Is Contamination of the Plant by the Weedkiller Glyphosate. the Leaves Described Above Often Develop in the Season Following Contamination, in Small Clusters of Pale Green or Pinkish-Red Leaves, Resembling Mini Witches' Brooms.
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why do leaves on rose bushes turn red