Lots of people ask me how to tell which zucchini flowers are the female ones. As the old saying goes, “a picture is worth 1000 words”.
The picture below shows a flower that is clearly attached to what looks to be a baby zucchini. That is a clear sign that you are looking at a female flower. Also notice that the stamen of the female flower is different from a male stamen.
If you look real close you can see there is actually a broken off male stamen inside the female flower. I did that to help bring the pollen from the male flower into the female flower. We have lots of pollinators, but why take chances!