I'm putting in a 2 course retaining wall around some shrubs in raised beds in the front yard where previously there were landscape timbers. Since I was only going up 2 courses (8") I just figured to dig down a couple of inches and lay down some sand to make leveling easier. But, then I was thinking that maybe pea gravel or crushed limestone would be better or maybe I should go deeper. What do you guys think? By-the-way this is in zone 5 (Michigan).
Thanks, Craig
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