Several concentrations and time of application of gibberelic acid (GA3) were tested in lettuce seed productíon under irrigated conditions of 'Sub-Médio São Francisco'. Babá cultivar that has a loose-heading at the end of the vegetative cycle was used. It was observed that GA3 promoted seed stalk formation and stimulated early flowering. However, its use as an agent for increasing seed production was not effective with this loose-heading cultivar, since the stalk emergence occured without the concourse of GA3.