Utah State University Extension
This fact sheet covers the basics of clay, silt and sand soils with an emphasis on gardening in soils with a high clay content. It includes information on the composition of clay soils, gardening tips for managing clay soils, and the types of plants that grow best in clay soils.
Wagner, Katie; Kuhns, Michael R.; and Cardon, Grant, "Gardening in Clay Soils" (2015). All Current Publications. Paper 732.