Several years ago, I threw rabbitbrush seed along our driveway, where pockets of chokecherry and New Mexico locust are interrupted by dry soil. Voila! This spring, clumps of the rabbitbrush appeared and are now flowering (photo).
I hoped to establish rabbitbrush on our property due to its autumn display and since it attracts a variety of ground-feeding birds, including white-crowned and Harris' sparrows. Of course, these bushy clusters will thrive (and likely spread) without my assistance. No irrigation or fertilizing necessary!