Plumeria in South Florida it may grow into a small tree. Its flowers are most fragrant at night in order to lure sphinx moths to pollinate them. The flowers yield no nectar, however, and simply trick their pollinators. The moths inadvertently pollinate them by transferring pollen from flower to flower in their fruitless search for nectar. Insects or human pollination can help create new varieties of plumeria. Plumeria trees from cross pollinated seeds may show characteristics of the mother tree or their flowers might just have a totally new look.The plumeria grows best in full sun and mild climates.