Different crops or plants have various needs, and hence, the best landscaping starts with soil preparations. Soil modifications give your new plants the best chance to thrive in the site you select for them. With soil amendments, you may change the soil type (texture), pH, salinity, and increase nutrients value of the soil. Even remediate the toxic materials from soil.Therefore, my question is there any international or national standard or specifications to prepare soil for landscaping for different purpose, in which basis the specifications have been prepared, and what is an important parameter, that should be concern, when you start to prepare soils for landscaping (soil texture, pH, nutritional content or soil free from contaminant material. Etc…).