The mix that I've used with good luck is peat, pine bark fines and perlite. My basic mix for each of my containers (2' X 4' X 18") is:
6 cu. ft. pine bark fines (i.e. 3 bags)
10 gal perlite
10 gal peat
lime
3 c. balanced organic fertilizer
1 c. greensand for micronutrients
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