Chris Hogg wrote:

What is the best way to stop wooden fence posts rotting below ground
level?

You could also use wood which is naturally rot resistant. Mature locust is
legendary; old farmer's joke:

How do you know when a locust fencepost needs replacing?
Well, you put a small rock on top of the post when you set it.
When the rock rots away, you should think about another post.

Now you're going to tell me it doesn't grow over there and this is a waste
of electrons? Grows like a weed in some areas here; nasty thorny stuff,
and hard enough that you need to have your chain saw file at hand while
cutting it...


Gary Woods AKA K2AHC- PGP key on request, or at www.albany.net/~gwoods
Zone 5/6 in upstate New York, 1200' elevation. NY WO G