Desert broom (Baccharis sarothroides), a woody perennial shrub, grows in U.S. Department of Agriculture plant hardiness zones 9 through 10. The female plant has attractive yellow flowers with a wispy appearance, but the blooms produced on the male plant are less attractive. This rapidly growing plant has an invasive nature, popping up in undesirable spots and quickly taking over the area. With the proper tools and plan of action, you can kill unwanted desert broom.
1 Cut the desert broom down to the ground with a brush cutter, saw or lawnmower. The best cutting tool for the job depends on the size of the desert broom and how many there are. For example, a saw works best on larger single plants with a diameter of 1 3/4 inches or more, while a lawnmower will quickly cut down a large group of desert brooms less than 1 foot tall.
2 Monitor the cut area for new growth, which typically appears a few weeks later. Treat new growth by spraying it with ready-to-use glyphosate herbicide.
3 Repeat the herbicide treatment as new growth emerges. The University of Arizona recommends spacing the herbicide treatments a month apart.