We have had treads about soil mix for figs but since it is one if not the most important element, I want to share this simple article:

The Best Soilfor Potted Figs | Home Guides | SF Gate

Good article

Very helpful.  Thanks!

I just try to make sure I have enough perlite and orchid bark in my mix. I even started putting a layer of orchid bark in the bottom of my containers to make sure its not sitting in water.

this year, i'm cutting both peat moss and perlite out of my typical soil mix for older trees and going straight to "nature's helper". ways i see it, that product already drains well enough and hold enough water. and adding same amount of peat moss and perlite will cancel each other out. we'll see how it goes in next year or so. bag of nature's helper around here is about 3.25. that will fill up about a 10 gal tub or used to.

I Never put sand in my potting mix.  In SF they probably don't move their pots.  Sand takes up space, adds nothing to the nutrient mix, holds little water and because it's so small, doesn't really improve aeration.  Plus it's heavy.  Perlite is a much better choice.  It's bigger, lighter and even holds more water because of its porous surface.  The only drawback is that it crumbles over time but if you're going to root prune and refresh the soil I don't see that as a big deal.

Also, SF rarely gets hot so they have very few water retentive elements.  For those of us that spend a lot of time over 85 you're going to want some water retentive elements or you'll have to water your figs several times per day.  I use small to medium pine bark chunks, peat moss, perlite, worm castings, composted animal manure, composted vegetable manure, Napa Floor Dry, food grade diatomaceous earth and Bulb tone.  Bulb tone is an organic fertilizer that has lots of beneficial micro-organisms including BTI.