June 2023

Gardener’s mailbag: Why do rose leaves turn yellow?

Dear Neil: Why do rose leaves turn yellow and brown? Looking at the one or two leaves in your photo it appears that droplets of water or some other spray have been on the leaves when the sun was shining brightly. That would account for the tiny brown “freckles.” The most common rose disease is called black spot, and it causes yellowing with large dark brown blotches in the centers of the yellowed leaves.

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