The Color Blue

We planted hydrangeas yesterday, one bluish-violet (hard to see much of the purple in this picture) and one pink.  Pretty soon, because of the acidity of our soil, they'll turn all blue, just like almost all the other hydrangeas in town (I understand they are the only flower that changes color like that as a direct effect of the soil).  And later still, they'll send their brown tumbleweeds blowing across our yard, like all the neighbors' hydrangeas do.