Bonsai Jack Universal Organic Bonsai Soil Mix #221, 7 Gallons Screened and pre-washed mix. Optimal pH of 6.4 Available in bag sizes from 2 quart to 28 gallons. Optimized for pH, water absorption, evaporation, bulk density and particle size. Ready to use for the vast majority of bonsai trees including tropicals. Phone support available with each order. Proven mix and professional supplier with more than a hundred thousand bags sold. Mix #221 is our number one selling bonsai soil. Phone support and advice is available with each order.