There are several indigenous genera of native tarweeds that are able to compete with aggressive naturalized weeds in disturbed areas of California. For example, the genus Deinandra (Hemizonia) is widespread in coastal foothills and valleys of California, including many annuals and a few perennial species. These California tarweeds are generally small plants with sticky, aromatic foliage. They are adapted to a Mediterranean climate with dry, hot summers. One common annual species (D. fasciculata) is fairly common in San Diego County in heavy, clay soils. It blooms during the summer months when the ground is so hard and dry that it is difficult to penetrate with a shovel. In fact, it actually grows like an aggressive weed in disturbed areas near Palomar College, and even colonizes disturbed ground which has been bulldozed.