Hortensia (Hydrangea); Artist: Pierre-Joseph Redouté; c. 1833. Hortensia, also known as Hydrangea, is a flowering shrub prized for its abundant clusters of blossoms and lush foliage. With its large, showy flower heads in shades of blue, pink, purple, and white, Hydrangeas add a splash of color to landscapes throughout the summer months. These versatile plants thrive in a variety of conditions and are cherished for their longevity, making them a popular choice for gardeners seeking enduring beauty.