[dmix]

How do you put down fence posts? A brief googling says they should be 36 inches deep.

[seltzered_]

Depends. Some combine the fence posts with concrete (adding weight), some add reinforcing metal posts, some do nothing. Watching fences collapse after a strong wind storm is a common sight.

Its worth noting you can generally still drill a hole into caliche.

[fmakunbound]

I use an 8 foot, iron digging bar ahead of the post hole digger.