The Femminello is actually a group of several different lemon selections, each of which has its own particular characteristics. They all have good vigor and productivity, as well as being ever blooming and ever bearing. Femminello selections account for about 75 percent of the Italian crop. All of the Femminello lemon varieties produce four crops per year (Sept to Nov, Dec to May, April to June and June to Sept.) The Femminello variety that I have is called Saint Teresa (named after Saint Teresa of Avila). I actually selected this particular variety because of the name.
Outside of the Mediterranean basin, Eureka is the most widely grown lemon variety in California, Australia and South Africa. The tree has a spreading habit but is only moderately vigorous and is much smaller than the other widely grown variety, Lisbon. Eureka is sparsely foliaged and markedly less cold resistant than Lisbon. Because Eureka is a smaller tree, it is often less productive than Lisbon, but it has a well distributed harvest season through late winter, spring and early summer. One problem with Eureka is its tendency to produce the fruit in terminal clusters (at the end of branches) with the result that the fruit is more prone to wind damage and sunburn than the Lisbon variety. Note that Eureka is not compatible with trifoliate orange and it hybrids, with the exception of Benton citrange. Eureka's fruit is also somewhat smaller than Lisbon. In recent years Eureka's popularity has waned in California in favor of Lisbon.
However, all in all, for a door yard tree you really can't go wrong with either type of lemon. (Citrus Varieties Of The World) - Millet - (921-)