Hydrangeas are valued for their beautiful and abundant flowers, making them popular choices for cut flower arrangements, weddings, and floral displays. They are also used in landscaping to add color and texture to gardens. Certain hydrangea varieties have the unique ability to change flower colors based on the pH level of the soil, which adds to their appeal. Additionally, hydrangeas are known for their longevity, with some flowers drying naturally and retaining their beauty for months.