The ability of primary wheat grains (cv. Sappo) to germinate was determined at different times from anthesis. Fresh, prematurely harvested grains germinated best at low temperatures (< 10.degree. C). The temperature range over which appreciable germination took place broadened and the maximum percentage germination achieved increased with lengthening time between anthesis and harvest. Chilling and exogenous applications of GA3 each affected the rate of germination and the maximum percentage germination of grains in their own wasy. The results are discussed in relation to the identification of dormancy in wheat grains.