I am trying to find the best soil for succulents in a Mediterranean climate.
For the pots I have planted so far, the mixture where the succulents seem to
grow like weeds and just love the soil it is about 1/2 fir bark and 1/2
sand. I read online that several people recommend 1/3 fir bark, 1/3 pumice
(I assume that is replacement for the sand?), and 1/3 Drystall (to absorb
and retain moisture). What do others have success with?

The 1/2 fir bark and 1/2 sand mixture is always dry on top and slightly
moist if you poke your finger a few inches into the soil. I didn't think
succulents liked soil that stays moist? However all of the plants I have
tried in that soil appear to really thrive.

In terms of fir bark, is there a particular brand or guidance on sizing of
the bark I should look for?

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W