The pH value of a soil is often overlooked by gardeners. The pH of soil determines the ability of the plant to draw nutrients, thus affecting the final crop. pH adjustment is often made chemically. But our specific purpose composts use organic rice husk ash to adjust pH. Rice husk ash has a very high pH, so when mixed incrementally into our cocopeat based compost, the pH rises to the level desired by the type of plants depicted on the label. So whilst our composts may look the same, the components are different, as required by the species.