Seeds of Nannorrhops arabica Silver. Over the past few years, this blue/silver leaved Nannorrhops has proved to be one of the most valuable additions to the range of cold hardy palms. It will thrive in the tropics as well as in temperate areas with good drainage even in wetter areas. With ample heat it is easy to germinate and very fast growing. Produces thick blue/silver almost white leathery, fan shaped leaves. It will resist cold temperatures to 40f if kept dry.