They are strictly warm-weather crops and seeds are sown outdoors when weather has warmed in the spring. Pumpkins vines are monoecious, which means both male and female flowers grow on the same plant. The flowers require a pollinator, usually honeybees, to transfer pollen from the male to female flowers.Click to see full answer. Then, how long does it take for pumpkins to grow after flowering? 55 days Additionally, how do pumpkins encourage female flowers? Usually pumpkin plants produce flowers in 10:1 ratio (male:female). To encourage lateral branches and increase fruit numbers some people pinch off the main vine tip when the plant is 2 feet long. Also please keep in mind that once the female flowers arrives they need honey bees for pollination. Keeping this in view, why does my pumpkin plant have flowers but no pumpkins? If the pumpkin delays female blossoming, late sets often do not have time to develop before the days shorten and colder weather sets in. Also, too much nitrogen in the soil can result in the production of primarily male pumpkin vine flowering or even lush, healthy pumpkin vines but no flowers or pumpkins.Do male and female pumpkin flowers grow on the same plant?First off, pumpkins, like other cucurbits, have separate male and female flowers on the same plant. That means that it takes two to make fruit. Pollen must be moved from the male flower to the female.