Triploids result either from the fusion of a two polar nuclei with a generative nuclei during fertilization leading to triploid endosperm.
Triploids are also important in certain crops for hybrid production. Crosses between individuals with different ploidy levels (diploid x tetraploid) can lead to a triploid hybrid that is sterile. They are seedless, but can also produce vigorous individuals.
Examples include seedless watermelon or triploid (mules) in marigolds.
