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Soil pH refers to the degree of acidity (sourness) or alkalinity (sweetness) of soil.   The pH scale has been adapted as the measure of acidity or alkalinity.  This scale ranges from 0 to 14, with 7 being neutral.  Numbers below 7 are acid, above 7 are alkaline.  All plants have a particular range of pH in which they grow best.  At pH values higher than are optimum for a particular plant, fertilizer in the soil can not be properly utilized.  High pH is very common in Florida soils, particularly along coastal areas.  This problem shows most often in “acid loving” plants such as Azaleas, Camellias, Gardenias, Holy, Ixora, Magnolia and certain grasses such as Bahia.  High pH usually shows as yellowing of foliage or an iron deficiency.