👉 Tiarella is a genus of flowering plants in the family Apocynaceae, commonly known as lilacs or roses. They are native to Europe and Asia, but also grow in temperate regions around the world. The flowers of Tiarella are typically small, with white petals that can range from pale pink to bright red, depending on the species. These plants have a long habit of producing large clusters of flowers, which bloom throughout the summer months.