Hybrids are seldom raised by experimentalists in great numbers; and as the parent-species, or other allied hybrids, generally grow in the same garden, the visits of insects must be carefully prevented during the flowering season: hence hybrids, if left to themselves, will generally be fertilised during each generation by pollen from the same flower; and this would probably be injurious to their fertility, already lessened by their hybrid origin.
Esperimentatzaileek oso bakanki hazten dute hibrido askorik eta, guraso-espeziea, edo beste espezie hurbil batzuk, eskuarki lorategi berean hazten direnez, kontu handiz eragotzi beharra dago loraldietan intsektuak bisitari etortzea; hibridoa, beraz, bertan behera utziz gero, bere lorearen polenak ernalaraziko du eskuarki belaunaldian-belaunaldian; eta hau kaltegarri litzaioke, hibridoa izteagatik jada urriturik duen ugalkortasunerako.