Our professional soil mix is hand sifted and packaged using Japanese raw materials. We use Akadama, pumice and black lava which have been imported from Japan. We mix this at a 1/3 ratio for each component. This mix introduces high amount of air exchange in the soil matrix and maintains water and fertilizer very efficiently. This mix is what we use for our own smaller trees and what we recommend for our students. This is a 3 quart container and includes free shipping! You may receive the plastic container or a heat sealed bag depending on availability of containers. We ship USPS/UPS 2 to 3 day normally.