( From BuildaSoil.com )
Base soil mix:
Equal parts:
CSPM (Canadian Sphagnum Peat Moss)
Aeration (Pumice/Lava rock)
Compost - Homemade is best but Malibus B/U is an excellent choice if it is available in your area.
Amended per cuF with:
1/2 - 1 cup Neem or Karanja meal
1/2 - 1 cup Kelp meal
1/2 - 1 cup Crab/Crustacean meal
1 cup MBP (Malted Barley Powder)
1/2 cup Gypsum (nice sulphur source)
4-6 cups Basalt dust
6-8 cups Biochar
1 cup lime (oyster shell flower, dolomite...)
***Small handful of worms per container***
See Also : More Info