Answer: Pumpkins, like most vining crops, usually start by producing alot of male flowers before the females. So, they do wither and die. When the females appear, it only takes a day or two at most for pollination to occur, so the blossoms are very short-lived, and will wither and fall off anyway.
You can hand pollinate the blossoms yourself by taking a small artist?s paint brush or Q-tip and rubbing the pollen from the male (without a small fruit behind the flower) flower and into the female (with a small fruit behind the flower) flower. I hope this information helps!
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