Can Dormant Oil/ Lime Sulfur Be Used On Perennials Other Than Roses And Trees In Early Spring?

Question

Last year I had some plants with powdery mildew and am hoping to get ahead of it this year. I dormant oil/ Lyme sulfur my roses in spring. I trimmed back the dead foliage to the ground on the affected perennials ( ie. salvia, speedwell, asters). Can I spray them too.

Answer 1

That should be fine. Here is more:

https://www.gardeningknowhow.com/plant-problems/disease/get-the-cure-for-powdery-mildew.htm