Go with crushed rock, and put enough down that you a have decent walkway or whatever, but not so much that you sink into it--you'll know the right depth when you get to it. Use a large rake to rake it out.
We have that around our trees in the front mostly because the grass didn't grow under them, and our dogs run back and forth barking at the kids playing in the street. We found it to be a very good solution to the problem. And we did put scalloped edging bricks around the whole area.
hayleydaniels
bubbasgma
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