If no pollen is available, silk elongation will continue but eventually slows to a stop within about 9 days after emergence, the result of which is indeed longer than expected silks. Kernel set near the base of the cob may fail if the silks deteriorate enough prior to pollen shed that they become non-receptive.

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Purdue University Extension explains why unusually long corn silks happen and whether they will negatively impact corn pollination.