Espoma Organic Bonsai Mix is an 
all-natural organic blend of the finest natural ingredients including 
calcined clay and expanded shale. Designed for optimum support, 
aeration, drainage, and improved moisture retention. This mix was 
specially formulated for use with all Bonsai to help roots grow and the 
plants to thrive. When repotting Bonsai, Spring is the best time to 
repot. Add a layer of this mix to the bottom of the container, and place
 the trimmed Bonsai in the container to inspect for height and growth 
orientation. If necessary, add more mix to raise plant height in the 
container. With orientation set add the mix around the roots to fully 
fill the container. Press mix down with fingers and planting stick to 
eliminate air pockets. Ready-to-Use.