Soul's Soilless Mix

50% Worm Castings
25% Promix
25% Perlite

Add a cup of PSG and dolomite lime per cubic foot of soil.

Soul recently published the following which differs from the above:

Lately I've been happier with a bit less wormcastings:

50% Pro-mix
25% perlite
25% wormcastings

I also mix in a cup of dolomite lime per cubic foot of soil & wet the mix with an organic tea made from dissolving a cup of PSG in a 5-gallon bucket of water.

See Soul's Guano Tea Method .