I buy what they call green wood. It is 4" by 6" by 8' and it seems to last very well. I built more first 9 raised beds out of it 4 years ago and it is still looking real good with no rot at least on outside...only thing leaching from the "green wood' is sticky sap...
Those boards make some nice hefty, sturdy raised beds..I have...$12 for each board so it does add up but I love em...
Keith
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