Basic Bonsai Soil From Buybonsai- 15 Lbs. 2 Gallons
Our own blend of Lava cinder rock, Composted fir bark fines, and other ingredients. Aprox, 60% Aggregate, and 40% organic pine bark. This is what we use. 2 - 1 gallon bags, about 7.5 POUNDS each.  Dont be fooled if you don't buy from Buybonsai, then it is not as stated, because it is not our soil.