Powdery Mildew vs. Large Potted Rosemary Brought Indoors
We had such a good time last May, friends and I, when I visited them in Ohio and we spent a day at the Mulberry Creek Herb Farm. They bought a 3' tall rosemary in a pot that's probably 16" in diameter, and left it outside for the summer, where it was very happy. However, after a few months of living indoors for the winter in front of a sunny windowsill, the rosemary developed a white bloom that I assume is powdery mildew. Is there some relatively non-toxic way of treating this plant? (I've heard Neem oil or certain solutions of baking soda in water help, but would love to hear about anything organic/natural that worked.)
Thanks in advance for your reply!