Masting is the synchronous production of large seed crops every two to several years within a population of tree. This intermittent seed production will destabilize the amount of seeds supplied to the forest ecosystem and affect the recruitment of seedlings constituting the next generation. On the other hand, mature trees that produce seeds are thought to reduce the amount of growth since they consume resources for the production of large amounts of seed in the mast year. In the past, few studies comprehensively examined whether seed production was correlated with seedling recruitment and whether it had a negative influence on tree growth. We investigated the number of 1-year-old seedlings and the seed production in an old-growth beech forest in western Japan for 8 years from 2011. In addition, we collected branches from the canopy of 8 to 10 individuals, and obtained data on the amount of annual shoot growth and female inflorescence scars. Using these data, collected increment core data and climate data, we analyze the influence of intermittent seed production on growth and seedling recruitment in masting species.