Changing ph of soil for stokes asters

Question

I have mildly alkali soil. Will using anthracite coal,dust or small coal chunks acidify. What about pine needles? The plants have survived over the,winter, but will probably die out, as situation now stands.

Answer 1

This can help some, but I would recommend using iron sulfate to safely acidify the soil. A soil test will be necessary to know exactly how much you need to lower the pH.