Desert Zinnia

Sunflower seeds, chamomile

Desert Zinnia ( _Zinnia acerosa_) is a compact native perennial subshrub of Arizona’s upper Sonoran and semi-desert grassland zones, one of the smallest and most unassuming members of the Asteraceae family. Found naturally on rocky slopes, dry flats, and calcareous soils between 2,500 and 6,500 feet across central and southern Arizona, it extends into New Mexico, Texas, Utah, and northern Mexico. In Arizona, its range centers on communities from Tucson and the Sonoran–grassland transition zones of Cochise, Santa Cruz, Graham, and Pima counties through the mid-elevation chaparral of Yavapai and Gila counties, and into the higher desert communities of Navajo and Apache counties. It is notably recognized as a plant of special value to native bees.

The plant forms rounded, woody-based mounds of narrow, stiff, needle-like foliage topped with delicate composite flowers that emerge in late spring and bloom prolifically through the monsoon season. Its deep taproot makes transplanting difficult but provides exceptional drought resilience once established, requiring only monthly supplemental irrigation in landscape settings.

As a member of Asteraceae, Desert Zinnia carries the sesquiterpene lactone allergy profile characteristic of the family. The primary risk for landscape users is contact sensitization rather than airborne pollen exposure, since the plant is insect-pollinated. Individuals with known Asteraceae sensitivities, particularly those already reactive to ragweed, chamomile, sunflower, or related plants, should wear gloves when handling the plant. For most Arizona residents, Desert Zinnia poses minimal allergy concern and is well-suited to low-water, low-maintenance landscapes at appropriate elevations.