The Horticultural Inspection Society (HIS) was founded in the autumn of 1970 by inspectors representing seven states gathered at the Kingwood Center in Mansfield, Ohio. They were assured of support by the Central Plant Board through its Resolution No. 1 adopted at its 46th annual meeting in Minneapolis, February 1, 1970.
The Horticultural Inspection Society is composed of several chapters, with members from various states who work closely with the Central, Southern, Eastern, and Western Plant Boards. These respective organizations make up members of the larger National Plant Board, and together with the USDA form policy, quarantines, and regulations regarding the interstate commerce of plant material within the United States.
The first group was designated "Central Chapter" and has 12 member states. The Eastern Chapter was organized in 1974 and the Southern and Western Chapters in 1999. Each Chapter works closely with their respective regional plant boards.