Thanks for the background story on the lone fencepost enveloped by the dancing tigerlilies... "stunning" is indeed the word. josh

How deep and wide depends on where you live. If you have wet/freezing temps consistenet in the winter, you want to go below the frostline in your area. You can get that info from your building dept. If freezing isn't a problem in your area, you have to consider the soils type. If it's loose, then you are going to want to go wider but not necessarily deep. Making the hole wider at the bottom and narrower at the top helps to keep from rocking. Too loose of soil you can go wide and fill with compactible filler soil and tamp the bottom and sides. In real rocky soil, non freezing, you can typically get away with minimum width and depth but in all cases, dig it out deep enough and wide enough to get some gravel in the bottom as well as around the sides after setting the post before concrete for drainage as mentioned above.

I had a bathroom project a while ago, I took up the laminate and put down tile. After the laminate came up, the whole floor was covered with the glue they use when laying it, it was like hard plastic. I had at the time researched some ways/products to use and came up with KRUD KUTTER, I know you can get it at either Home D or Lowes and I think you can even now get it at Wally world. I used it full strength, poured it on, left it (dont remember how long) came back with a putty knife and it was all gooey and soft, came right up.. I wouldn't have believed it if I hadn't seen it with my own eyes. another example of what I've used it for. I had a perpetual haze on my laminate wood floors (most likely from a build up of cleaning products etc. caught one cleaning lady using mop and glow on it, ugh) anyway, it would never stay shiny and clean looking. I had tried several things and finally tried the KK, again, full stength but I didn't leave it very long. came back with a plastic spatula/turner and literally scarped off a yellow film. It did not appear to hurt my floors, and the haze was forever gone, (now I only use vinegar and water). Might be worth a try? Well, I dont know if it can hurt to try it, Disclaimer: I have no affiliation with this product and have no information on how it might work or affect your floors :) I think it's a great product with many uses and just thought I'd mention it.

I used concrete for set most of my yellow pine posts for my horse fence. I haven't seen a problem but I think the yellow pine is a better wood than what you buy at local Menards or Home Depot. I'm putting in a solid privacy fence and am torn as to use concrete or not for the treated wood posts.