Healthy soil is vital to tree health. A healthy growing medium is defined as an amended existing topsoil that contains organic matter, a typical clay content of ›25% by mass, is capable of sustaining vigorous plant growth, and complies generally with the typical uses of AS 4419 (2003). It should also be free from unwanted matter such as stones larger than 1/2″ (10mm), sticks and garbage, or material toxic to plants.
Please download this soil specification for more details. Although we do provide this recommended soil specification for your convenience, it is worth noting that any typical sandy loam soil, or soil specified by a landscape architect or soil professional, will suffice adequately in the ArborSystem.