Technically, any soil
that has a
pH above 7.0 is considered an alkaline soil.
Most plants grow best in a slightly acid soil with a pH
in the 6.0 to 7.0 range. A few such as
boxwood, heaths, heathers,
pin oak and
others do best in a more acid soil in the range of pH
4.5 to 5.5. So, excessive alkalinity in the soil can be
Generally speaking, the
soils east of the Mississippi River tend toward an acid
reaction while those to the west are more alkaline. This
is due to the amount of reliable rainfall in each area.
Remember that the H in pH stands for hydrogen and water
is H20. More rain equals more hydrogen.
However, you should
ALWAYS run a soil test through a reputable soil
laboratory such as at your land grant university to
determine your particular soils pH.