Blue hydrangeas are popular flowering plants known for their vibrant blue blooms. The color of the flowers can vary based on the soil's pH level; acidic soils tend to produce blue flowers, while alkaline soils result in pink blooms. These plants thrive in well-drained soil and prefer partial shade. In addition to their striking appearance, blue hydrangeas are often used in gardens and floral arrangements. They typically bloom in summer and can last into fall. With proper care, these hardy shrubs can grow to be quite large, making them a stunning focal point in any landscape.