Question: Do we remove last year's mulch first before putting out new mulch, or do we just put it right on top?
Answer: You don't need to remove last year's mulch. You can either dig it into the soil and add new mulch, or you can leave it alone and just add an inch or two of new mulch, right over the top of the old mulch.
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When singular and plural spellings differ, as in peony and peonies, try both.