We have previously shown that DefH9-iaaM eggplants outperform control plants during protected winter cultivation by an average of 33% [10]. The present manuscript presents data on the agronomic performance of DefH9-iaaM eggplant hybrids during spring and summer cultivation. Seed-derived F1 plants perfectly reflects the real agronomical situation of eggplant production. In addition, they have allowed to demonstrate that the transgene is active after meiosis and give satisfactory results in the hemizygous state. Different types of eggplant hybrids have been evaluated during springtime in unheated greenhouses in two different locations. To evaluate GM parthenocarpic eggplants under optimal environmental conditions, a single trial has been carried out using two different genotypes under standard open field cultivation during summertime. Furthermore, we demonstrate that the DefH9-iaaM gene is expressed during late stages of fruit development.