That these processes are often injurious to the fertility of a plant cannot be doubted; for Gartner gives in his table about a score of cases of plants which he castrated, and artificially fertilised with their own pollen, and (excluding all cases such as the Leguminosae, in which there is an acknowledged difficulty in the manipulation) half of these twenty plants had their fertility in some degree impaired.
Ez dago zalantzatan jartzerik horrelako ihardupideak maiz kaltegarriak direla landarearen ugalkortasunerako; izan ere, Gärtnerrek, bere laukian, berak irendu eta beraien polenaz artifizialki ernalarazi zituen hogei bat landareren kasuak ematen ditu, eta-lekadunek bezala, manipulatzeko zailtasun berezia duten kasu guztiak kanpo utziz-hogei landare hauetarik erdietan ugalkortasuna gutxitu egin zen mailaren batean.