Hello I always heard growing up that you could change the color of hydrangea blooms by what you put in the soil. If you wanted blue blooms you added a lot of acid, if you wanted pink blooms you planted rusty nails around the roots, for white you just left them alone. Does anyone know if this is true or not? I have never tried it and wondered if there was any truth to it or not. I have read that hydrangeas like acid soils so I figure that much of the old wives' tale is true.