Q.my rosemary plant has a white substance on it
What is it? And should it be removed?
Heather
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on April 21, 2011
This is powdery mildew. This article will help:
https://www.gardeningknowhow.com/edible/herbs/rosemary/white-powder-on-rosemary.htm
https://www.gardeningknowhow.com/plant-problems/disease/powdery-mildew-homemade-and-organic-remedies.htm
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