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Mushroom industry development officer, Geoff Price pictured at Elf Mushrooms farms, with Mushrooms ready for market. The mushroom industry has been in the Hawkesbury area since 1930 and employs 700 people, making it the second biggest employer in the area after the RAAF.The smell wafts from three major mushroom compost producers in the Hawkesbury who supply the area’s 35 mushroom growers with the raw materials for graving compost - a rich, steaming hot mixture of wheat straw, stable bedding, poultry litter, cotton seed wastes and other organic materials. July 15, 1993. (Photo by Peter Rae/Fairfax Media via Getty Images).