From David Beaulieu,
Your Guide to Landscaping.
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Definition: A plant species is said to be dioecious when its male and female reproductive organs are carried on separate individual plants of the same species. When a plant species is dioecious, at least one male plant must be present in a group for the fruit-bearing female plants to be pollinated. By contrast, "monoecious" plants are plants having unisexual reproductive organs or flowers, with the organs or flowers of both sexes borne on a single plant.

Alternate Spellings: diecious