What Is Acid Soil?
Acidity or alkalinity of a substance is measured by the pH factor and described by a number on a scale that runs from 1.0 to 14.0 pH, with neutral represented as 7.0 pH. Lower numbers are more acidic; higher numbers are more alkaline. Most garden soil is neutral, an acid-alkaline balance that makes a larger amount of the minerals in the soil available to plants. Most garden plants tolerate a range of pH values, though some prefer soils that are more acidic or alkaline.