Q: Any guess on how long untreated exposed cedar will last in the dirt?
A: Assuming it is not old growth, it will depend on how thick it is, but the buried surface will start to compost in a year or so. How long it takes to get through the board depends on the climate and board thickness. Where I live, in the wet Pacific Northwest, a three quarter inch board buried in soil will compost to loam in about two years.
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