Johnsons's Garden Centers Text File document - copyright 2007
PDF file available at http://www.johnsonsgarden.com/newsletter/nurseryplants.html

Pink or Blue?
April / May 2007
Sallie Strole, Johnson's East Store

    Pink or blue? That question brings up different images depending on
your situation in life. A young couple might think of a baby girl or
boy. Gardeners will likely think about hydrangeas.

    Hydrangeas bloom either pink or blue, depending on the pH and the
aluminum content of the soil. Our soils in this area are generally
alkaline which make the flowers naturally pink ... perfect if you like
girls.

    But if you desire to change pink into blue, there are several steps 
to take. Even if there is enough aluminum in the soil, our high pH ties it 
up and the plants can't use it. Apply Hi-Yield Aluminum Sulphate to lower 
the pH and add aluminum. Generally, use about one half pound (about one cup)
for smaller shrubs under two feet and one pound for larger ones. Dissolving 
the aluminum sulphate in water is a quicker way to get it to the plant. You 
can do this in the spring and fall until you achieve the desired shade, 
then once a year should keep the result. Mulching with Cotton Boll Compost 
will help maintain the soil acidity as well as conserve much wanted moisture
around hydrangeas.

    Pink or blue, both are beautiful, but if you have a distinct
preference you can effect it more easily on hydrangeas than on babies.