Bluebird Hydrangea or Hydrangea Serrata 'Blue Bird' is a drought-tolerant, deciduous flowering shrub. Depending on the soil pH, its bloom color varies from light purple to bright blue. Its large, light blue lace-cap florets and green foliage transition to deep burgundy or red in the fall. It is a low-maintenance accent shrub that will return each year with its stunning display of blue blossoms. It attracts birds and butterflies making it a wonderful addition to your garden.