Plants homozygous at the sex locus for the dominant male allele, M (supermales) are valuable as parents of all-male asparagus hybrids, which are generally higher yielding and more homogeneous than mixed-sex hybrids.A novel method is described that uses outcrossed andromonoecious plants to generate supermales.Previous work by J.Sneep reports the undesirable expression of andromonoecy in the progeny of plants fathered by supermales generated from repeated selfing of andromonoecious plants.In this study, outcrossing highly andromonoecious plants descended from Sneeps germplasm with a pollen donor lacking andromonoecy appears to have been successful in producing supermales capable of producing offspring that express andromonoecy rarely or not at all.Two populations were produced using one andromonoecious female outcrossed with two different males.