Maize (Zea mays) is a monoecious crop with unisexual flowers separated on the same plant: the terminal staminate inflorescence is the tassel, while the lateral pistillate inflorescence is the ear/cob.
In commercial hybrid maize seed production plots:
Male (pollen parent) and female (seed parent) inbred lines are planted in alternating row ratios (e.g., 2 male : 4 female or 2 male : 6 female).
Before anthers begin shedding pollen, the tassels of all plants in the female rows are manually removed (detasseling) or genetically sterilized (CMS).
This ensures that female plants receive pollen exclusively from the adjacent male rows.