Powdery mildew. Doesn't look too bad yet. Very common. Wet feet and too good of a
fresh fluffy soil. Especially if it has moisture control.
I can't over-winter rosemary so i pick up a nice fresh grown plant like yours every
season. It goes right into a pot that grew something else last year. Nice spent soil, good
drainage, sometimes add some sand. No mulch. No food.
For a cure i believe potassium bicarbonate is the best solution. It is a contact fungicide
and will kill off the fungal spores.
I use baking soda on my zucchini but it is only effective as a preventative. Not a cure.
Seems counterintuitive to use water, but laying the pot on its side, spraying heavily to
prevent the puffy loose spores from sticking like a good bath, then spraying...
and get it in some wind to dry off quickly.
And changing the soil will keep it from coming back. Cheap stuff. Dirt. Loves sun but not
wet feet. Mimic dessert dry conditions. And ignore. If you can't move it out of the rain,
cover the soil of your pot with something, like a plastic sleeve so it doesn't get a
constant saturation. Mine is doing just fine in old soil even with some good storms.
Some use a milk spray or dilute vinegar, even mouthwash.
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