Will I Need To Replace Or Treat My Garden Soil?

Question

Powdery mildrew went through my flower garden this summer and killed all my zinnias and perennial salvia. I have removed all the affected plants; now do I need to treat or replace my garden soil in order to get rid of this fungus, or it it strictly airborne?

Answer 1

No, you don't need to treat the soil, but make sure all the leaves that dropped are picked up from the ground and placed in the trash.

It is airborne like you said.
https://hgic.clemson.edu/factsheet/powdery-mildew/