I have many years of using & observing black-locust tree wood for in-ground use. Trunks (even when split) for posts last longer than any other wood here. But small trunks or saplings, and stake diameter branches, rot faster than you'd think a rot-resistant wood should. But the cut plants regrow so fast, you just replace the stakes. Zero toxicity as far as I know, except avoid the thorns in the growing season. If labor is a major issue, know purchased treated posts may last longer than small diameter locust.
tc, sWI, where black locust grows better than anything else
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