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> Fully soaked ground will actually preserve wooden piles (wood decay is aerobic and requires oxygen).

When building fences, the ground-air interface is often where rot occurs, and there are products to protect that area:

* https://www.postsaver.com/en-gb/products/pro-sleeve-fence-po...

Any idea how well those stand up to lawn trimmers?

It looks like a layer of plastics, so I would expect not well. Though, the part you'd hit would be above the ground, so it might still protect pretty decently for all the below ground stuff. You might consider putting a small set of stones around it so that the trimmer cord hits those instead of the wrapped wood.

> You might consider putting a small set of stones around it so that the trimmer cord hits those instead of the wrapped wood.

Stones could help with drainage and drying as well.

Should probably just do a layer of stones under the whole fence... then you'd get that benefit for all of the boards that are close to the ground and not just the posts.

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