Soapy water damaging my Dahlias?

I sprayed my Dahlias with soapy water and it caused black spots and some transparency in the leaves. Why?
Submitted by lrmadcow



Thanks for writing. Many soaps and detergents contain chemicals that can be harmful to plants if used too frequently or too much at one time. That's one of the reasons I tend to steer clear of those old "home remedies" --- just because something is used around the home doesn't mean it's safe.


---Justin, Senior Garden Editor,


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