Potting soil isn’t appropriate for using on the ground for this purpose…too lightweight, not actually soil at all but usually ground bark or peat or both, with other things mixed in. Great for the confines of a pot where heavier stuff would prevent good drainage and where the walls of the container keep it in place. The real soil is much heavier, and hence more expensive, but more correct for the purpose.
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Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.