The method of treating dicotyledonous seedlings involves contacting dicotyledonous seedlings one or more times into a composition comprising at least one cyclopropene prior to dicotyledonous seedlings being transplanted. The method of treating crop plants involves contacting the crop plants one or more times with a composition comprising at least one cyclopropene while the crop plants are in a particular developmental stage such as the reproductive growth stage.双子葉類実生の処理方法は、双子葉類実生を移植する前に、少なくとも1つのシクロプロペンを含む組成物に双子葉類実生を1回または複数回接触させることを含む。作物植物の処理方法は、作物植物が生殖成長段階などの特定の発育段階にある間に、少なくとも1つのシクロプロペンを含む組成物に作物植物を1回または複数回接触させることを含む。