I think the answer is going to be small pebbles. I have been confronting the same challenge and have been using shredded bark. It works to some extent, particularly around the taller sedum but in the area where I am composing with low growing varieties, the shredded bark does not seem quite right.
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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.