Answer: Lack of pollination is usually the problem when pumpkin vines fail to produce fruit. Pumpkins have separate male and female flowers. The male flowers are produced first, followed by female flowers. It is possible that when you cut the vines, you had only male flowers. When no female flowers were formed, your plant had no way to produce fruit. If you want to grow pumpkins again, make sure that some fruit has set before cutting back the vines. Just FYI, male flowers have straight stems attaching them to the vine; female flowers have a small swelling directly behind the petals. Female flowers are the ones that develop into fruit.
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