Phoenix dactylifera, common date palm supposedly became more popular than Phoenix canariensis, Canary Island date palm during the 1990s for two primary reasons. Firstly, it is less susceptible to pink rot that was killing so many Canary Island date palms at that time, and continues to do so. Secondly, mature specimens became so readily available as their orchards were being displaced by urban development, particularly around Las Vegas and Palm Springs. Of course, fruiting date palms would have been too messy for the urban landscapes that they were recycled into. So, to prevent such mess, only female trees were recycled for such landscapes. Without their male pollinators, they are fruitless. Female trees are generally shorter, more lushly foliated, and therefore more appropriate to refined landscapes anyway. Besides, all but between one and five percent of trees in date orchards are female. Male trees were not completely wasted though. Although not as lush, they are taller and statelier, so were recycled to landscape remote desert highway interchanges, where their pollen does not reach female date palms that now inhabit more urban landscapes. It all works out well, although contrary to the original purpose of the date palms involved. It would seem silly to separate genders of most familiar dioecious species, such as kiwifruits and hollies. However, only female carob trees are available from nurseries nowadays because they would be messy with pollination, and also because male floral fragrance is horrid! Male carob trees are only available for agricultural purposes, or grow as feral males from seed. The problem that I will eventually encounter with my carob trees is that I grew them from seed, and will not know what their genders are until they are a few years old. I want a female specimen in a specific location, and a male pollinator in another specific location. I think that I will put three seedlings in each location, select one that matures to be the preferred gender for its particular location, and eliminate the other two. Alternatively, I could allow two genders to grow together in such a manner than the male grafts to the female to become a branch that I could prune to be a small but necessary portion of the collective canopy. Of course, there is a possibility that all within each group of three could be the wrong gender. I will not know until a few years from now.