Powdery mildew on rosemary leaves Q • The leaves of my rosemary ... and soil should be allowed to dry out on top (but not throughout) between waterings in the winter. The whitish growth on ...
Bring two to three cups of water to a boil in a saucepan. Add a handful of fresh or dried rosemary leaves to the boiling water. Reduce the heat and let the mixture simmer for 15–20 minutes.
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