Hardwoods if you have access to them. Cedars aren’t bad either and have used cane in the past. A biologist in S.W. Arkansas dove on some of their cane piles they put out several years ago on a lake down there and he said he was very surprised how well they held up. They were going to place hardwoods or cedars near the cane to refresh the piles. I have also heard that some folks make piles out of ironwood. Very dense wood that I bet would last a really long time underwater. Hard to find a good supply of ironwood though.
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