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How long can pollen tubes take to reach orchid ovules?
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Orchid
Yellow flowers of a cymbidium orchid (Cymbidium species).
In orchids, after a pollinator deposits pollinia onto the stigma, the pollen tubes germinate and grow down the center of the column to reach the developing ovules in the ovary. This process is relatively slow, and the pollen tubes typically take about six weeks or longer to reach the ovules to initiate fertilization.1