I want to change a blue hydrangea to pink. Can it be done? And How? Thanks?

It can be done, the color of the flower is a matter of soil acidity. If you want it to be more blue, give it aluminum sulfate. If you want it to be pink, sweeten the soil with a side-dressing of lime in the spring, but it is much harder to go to pink from blue than the other way around. There are some really pretty pink hydrangeas on the market, perhaps it would be easier to just plant one of them. Here's a web site with more info:

http://www.hydrangeashydrangeas.com/colo...