Maybe he ment Iron Sulfate.

"Marley1372" wrote in message
...
You can only alter the color of your hydrangeas if they are the varieties
that
are SUPPOSED to be blue and are not. If it is a named variety that is
supposed
to be pink, you arent going to be able to turn it blue. It will probably
take
several years for this change to take place. The reason nothing has
happened
is that Iron is not the factor affecting flower color, but pH is. You can
add
all the iron you want to the soil but it dosent change the pH.

Toad