Citrus trees date back to China circa 2201 B.C. Today Citrus is big business and provides enjoyment for personal property owners too. There are about 40 difference types of Citrus trees from Chandler Pummel to Lindquist. Some are best for fruit while others are better for shade and landscaping. The most common trees here in the Valley of the Sun(Phoenix, Ariozna)are; Marsh Grapefruit, Navel, Eurek Lemon, Tanglo, Mandrian and Tangerine. All Citrus trees here in the Valley are grafted trees from sour orange or lemon tree stock. Citrus trees grows very well here in Phoenix. The Arizona soil contains adequate supplies of all the necessary nutrients except nitrogen. There are cases in which the soil has been so depleted it has to be re-balanced with a good fertilizer.