Having male and female reproductive organs on separate individual plants of the same species. This means some plants are entirely male while others are entirely female.
From Greek 'di' meaning two and 'oikos' meaning house, literally meaning 'two houses.' Also coined by Linnaeus to describe plants where male and female flowers occur on different individual plants.
Holly trees are nature's way of ensuring genetic diversity - you need both a male and female holly tree in your neighborhood to get those beautiful red berries, since only the female trees produce fruit!
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