Pumpkin......?

Question

Will one pumpkin plant by its self bear fruit? Or does there need to be two for polination?

Answer 1

Pumpkins are monoecious, having both male and female flowers

From this site:

http://en.wikipedia.org/wiki/Pumpkin

Both male and female blossoms would have to be open at the same time for pollination.

Answer 2

One is fine, all you need are bees to pollinate it. No bees? Pollinate it yourself, it's easy.