Medicago polymorpha, commonly known as California burclover, is an annual broadleaf plant originally native to the Mediterranean region. It typically inhabits open fields, grasslands, and other disturbed areas. The plant forms a symbiotic relationship with nitrogen-fixing bacteria, which allows it to thrive in poor soils. It can grow up to 2 feet long and features trifoliate leaves and small, bright yellow flowers that bloom in the spring. The fruit is a coiled pod covered with hooked prickles, which can attach to animal fur or clothing, aiding in seed dispersal.

California burclover is valued for its ability to improve soil fertility by fixing atmospheric nitrogen. It is often used as a cover crop or green manure in sustainable agriculture practices. In gardens, it can serve as a ground cover, although its invasive potential should be considered. It prefers full sun to partial shade and tolerates a wide range of soil types, provided they are well-drained. While generally low-maintenance, it can become problematic if allowed to spread unchecked, potentially outcompeting native plants.CC BY-SA 4.0