On Jun 15, 9:57 pm, gpsman wrote:
On Jun 15, 9:08 pm, "James" wrote:

Nope, sorry. Gonna use concrete. My question relates to the best
concrete, and the method to plant them.

The best concrete to set posts is none. A couple inches of gravel in
the bottom and ALL the dirt back in the hole is the "proper" method.

And 18" is too shallow; a waste of, time, effort, money -and- concrete
if you're still set on using it. 30" is minimum and probably code,
and 36" is better.

Locust is the best choice for the posts, but you'd be better off
setting them on fire rather than in concrete. Nothing lasts forever,
try digging out a post set in concrete. By the time you're finished
you'll have changed your mind, if you live through it.

The concrete mix doesn't matter, any one will rot your posts as well
as another.
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- gpsman

I guess I will at least answer your question -

Most big home centers carry "post-set" concrete. You dig the hole,
put the post in (with space around it) fill the space around the post
with dry mix, add water, and mix it up by pushing a pc of rebar up and
down in the "soup". Sets quickly, works fine and is very convenient.

JK