Bill Evans is correct, the Black Locust used for fence posts is Robinia
pseudoacacia, not Honey Locust, Gleditsia triacanthos. I have not heard of
a thornless variety, although propagators have tried to breed one. I had
success controlling the suckers in my fence post lot by hand pruning them
once per year, and by mowing to cut the seedlings. I have observed them to
be less invasive in plant hardiness zone 5 and north. Has anyone in the
upper midwest had the same observation?
One comment on the use of Redwood in fencing - it is not sustainable.
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