Ceanothus is a genus of flowering plants in the buckthorn family, known for its vibrant blue flowers and evergreen foliage. Commonly referred to as California lilac, these shrubs are native to North America, particularly in the western United States. They thrive in well-drained soils and are often used in landscaping for their drought resistance and ability to attract pollinators. There are over 50 species of Ceanothus, varying in size and growth habit. Some species can grow as low ground covers, while others can reach heights of up to 10 feet. These plants are popular in gardens and natural landscapes, contributing to biodiversity and providing habitat for wildlife.