More Pumpkin Questions

Okay, I should have been more specific about my inability to grow a pumpkin. I have two vines that have shown themselves recently. They have yellow flowers on them. I don't care what size the pumpkin is that grows from the vine, but once I had a pumpkin vine that covered my yard and was bright with flowers but never fruited. Do I have to pluck the unwanted flowers?

I have better luck with tomatoes. And mugwort, and jewel weed. If you need mugwort or jewel weed, call me right away.