The deposition of incompatible pollen grains in the stigma can interfere with the performance of compatible pollen grains and compromise the reproductive success of the species in the community. We investigated the influence of incompatible intra- and interspecific pollen grains on the reproductive success of Ipomoea asarifolia, based on analyses of natural pollination and controlled experiments. Our hypothesis is that the presence of incompatible pollen grains in the stigma negatively interferes with the formation of fruits and seeds in I. asarifolia. Fruit yield was significantly higher in cross-pollination than in natural pollination and mixed pollination experiments of compatible (intraspecific) + incompatible (intra and interspecific) pollens. And seed yield was significantly higher in cross-pollination than between the two mixed pollination experiments. Fruit production was not significant between cross-pollination and natural pollination, nor between natural pollination and mixed pollination experiments. However, fruit and seed production was higher in cross-pollination than in other situations. And experiments with incompatible amounts of pollens do not form fruits. Few fruits and seeds are formed in the presence of incompatible pollens (intra and interspecific), which may be interfering with reproductive success in I. asarifolia, especially in the long term. We reinforce the importance of the selection of reproductive displacement in the species to minimize the flow of incompatible pollens and their reproductive interferences.