I have just put up an all -wood fence (posts, gravelboards & panels), using postmix.
I followed the instructions exactly, digging holes the right size and depth, but the mix did not fill the post holes right up to ground level.
A neighbour suggested cutting the bottom out of a big plant pot, dropping it over the post and filling with pea gravel, then backfilling the rest of the hole with soil. Would this be OK. or would the gravel hold too much moisture and rot the posts, (which have been presure treated)?
Alternatively would it be better to use more postmix on top to fill the holes?
Yout advice would be much appreciated, thank you.