This document discusses soil properties for growing plants and turf. It explains that greenhouse growers mix different soil-less materials together to make a soil suitable for growing plants inside that does not contain insects, diseases or weeds. Some common organic materials used include peat moss, compost, sphagnum moss and bark, while common inorganic materials include vermiculite and perlite. Horticultural soils have advantages like being sterile, having a neutral pH, and being disease and weed free. The document also covers soil structure, texture, pH, physical properties and the process for soil sampling and testing.