Femminello lunario has a distinct advantage for those living in cold areas, tough. When in 2011 we had a cold snap and all my lemons got defoliate, I haven't had a single fruit on any other lemon during the following winter, except for femminello lunario: this plant, as soon as re-leafed, resumed blooming, and even if its fruiting was sparse (which i also have found it is the case, at least on my pot bound plants) it never missed a single year.