Ambrosia cordifolia, commonly known as Tucson Bur Ragweed, is an evergreen subshrub or shrub native to arid desert scrublands and rocky slopes in the Southwestern United States and Northwestern Mexico. It typically reaches a height of 2-3 feet (0.6-0.9 meters) and a width of up to 1 foot (0.3 meters). This plant is characterized by its green, deeply lobed leaves and inconspicuous greenish flowers that may cause allergic reactions in sensitive individuals. The flowering season extends through the late summer and fall, and while the flowers are not showy, they are an important source of pollen for local wildlife.

Tucson Bur Ragweed is valued for its drought tolerance and ability to thrive in harsh desert conditions, making it suitable for xeriscaping and naturalistic plantings in arid regions. It is often used in restoration projects to stabilize soils and provide habitat for wildlife. This plant requires minimal maintenance, thriving in full sun to part shade and preferring well-drained soils. Overwatering should be avoided to prevent root rot. Gardeners should be aware that Ambrosia species can become weedy and may spread aggressively in favorable conditions.CC BY-SA 4.0