No matter how big and healthy a plant may be, you must have pollination in order for the fruits to develop. Many plants like tomatoes, peppers, and beans have male and female parts within one flower. But for many plants like cucumbers, pumpkins, squash, and melons, their flowering structures are separate. For pollination to occur in these plants, the male pollen must reach the female flower (specifically the stigma) - no matter how far apart they may be.
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