I've done it both ways, set in concrete, and not used concrete. Have never been able to tell a difference. I have used crossties, treated posts, and cedar. As has already been said, I just dump the concrete mix around the post, pour some water in the hole, and that's it. If the ground is already wet, you don't need much water at all.
JamesJr: When you didn't use concrete with what did you backfill? Thanks -tnscouter
