thorny locus

If you build a fire and stick the end in the fire and char them they won't rot. The old timers did that years ago. My dad had an old stump he burned and it sat there for almost 15 years. I went and cut the remainder off that was sticking up cut it at ground level and it was gone the next year.
 
There's a dozen or so 10" - 12" dia locust posts supporting my father in law's grape arbor. They have been in the ground 55+ years and are still in good shape.
 
If you are speaking of honey locust (very long thorns), about 5 years. These are not suitable for fence posts.

If you are speaking of black locust (short thorns) that does not have fungus, 30 yrs+ below ground. Usually less above ground due to UV.

Dean
 
I was told to remove the bark and they will last a long time. I saw some last summer that I set in 1973, and they are still solid.
 
The kind that I have here, flowers once a yr. ,and it looks like a snow fall on the ground. They have thorns, and roots that run way out under ground, and start new trees, and will uproot sidewalks,ect. I uncovered a dozer pile, with logs burried in it for 11 yrs, and used them for end post's, that was 13 yr's ago and they are solid now.I just wish, more of them were straight!
 
You are describing black locust.

The make good, long lasting fence posts IF they do not have fungus and are harvested properly.

Dean
 
As said if they are the Honey Locust with very sharp thorns over an inch long they won't last very long at all.On ther other hand if they are Black Locust they will outlast just about anything else.If you want them to last cut them down on an old Moon and let them dry out for about 2 years before putting them in the ground.Also the limbs make the best firewood you can cut.
 

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