Thought so about the treated lumber. Wonder how long the nasty stuff lasts in the wood? Forever probably. I have 4' sized scraps taken off 24' of my 40 year old downsized deck. I stashed them out of sight beneath the deck thinking I could use some of the pieces for tomato stakes, but never did that. I always kept wondering about the 'treated' part and how it would affect my prized tomatoes. So it's best I just toss them all.
Good about the driftwood.
Thanks.