The relationship between axillary bud outgrowth of2nd below first flower truss and main stem elongation of every12hours in indeterminate type ‘Mini Carol’ and determinate type ‘Suzukoma’ of tomatoes(Solanum lycopersicum L.)was investigated. Stem elongation in 12 hours before axillary bud outgrowth was reduced in both cultivars. In addition, stem elongation of nighttime was greater than that of daytime.