Basic Bonsai Soil From Buybonsai 4 Quarts (1 Gallon) About 7 to 8 Pounds BASIC BONSAI SOIL MIXED BY US AT BUYBONSAI FAST DRAINING Prevents root rot, Prevents over watering Aprox 60% Aggregate, 40% composted fir bark fines. Double Sifted, Lava cinder rock and Calcined Clay 1 BAG ABOUT 7.5 POUNDS STOCK UP NOW FOR SPRING TIME POTTING