So this year I tried a couple of pumpkin vines (a gray and a white). The white died, but one gray jarrandale survived. I figured I might get lucky and be able to hand pollinate to get a few pumpkins off it, so I left it to go by itself.

I checked in on it practically daily all season, and it never had a single female flower on it. I saw dozens of flowers come and go, all male.

Are pumpkins gender specific? Is a vine either entirely male or entirely female?