It is easy to identify whether a zucchini flower is male or female. For one thing, female flowers are usually much bigger than male flowers. Although male and female flowers look alike, the male flowers have a stem attached to the end of them, while the female flowers have a growing zucchini attached to them. In the photo below, the flower on the left is a male flower, while the flower on the right is a female flower and has a zucchini growing behind the flower.