Hi, Bob. Thanks for your question; I would not add 4 to 6 inches of soil. I think you can get away with a couple, but woody plants, in particular, don’t like to be planted too deep or smothered later in life this way. Have you seen the article I did on the blog about underplanting? I try to to tuck things in here and there and add maybe an inch or two of soil and an inch or two of fine-textured organic mulch (let’s say a combination of 3 inches total). The mulch breaks down in time so isn’t as problematic as soil. The underplanting article: http://awaytogarden.com/10-thoughts-on- … erplanting See you on the forums and blog! M.
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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.