 A major disadvantage to vegetative reproduction, is the transmission of pathogens from parent to offspring; it is uncommon for pathogens to be transmitted from the plant to its seeds (in sexual reproduction or in apomixis), though there are occasions when it occurs.Seeds generated by apomixis are a means of asexual reproduction, involving the formation and dispersal of seeds that do not originate from the fertilization of the embryos.Hawkweed ("Hieracium"), dandelion ("Taraxacum"), some Citrus ("Citrus") and Kentucky blue grass ("Poa pratensis") all use this form of asexual reproduction.