Crape Myrtle

None well-documented

Crape Myrtle ( _Lagerstroemia indica_) is among the most popular ornamental trees in Arizona, planted extensively throughout the Phoenix metro area, Tucson, and surrounding low-desert communities for its brilliantly colored summer flowers, attractive exfoliating bark, and reliable performance in heat. Native to East Asia, it was introduced to North America in the late 1700s and has since become a defining feature of warm-climate landscapes across the American South, the Southwest, and Mediterranean-climate regions in California, Arizona, and Nevada. Wikipedia specifically notes that it thrives in the desert climates of Arizona, though it requires supplemental irrigation in Arizona’s arid conditions more than drought-native plants do.

From an allergy standpoint, Crape Myrtle is a low-to-moderate concern. Its OPALS score of 5 places it in the middle of the allergenicity scale, and because its showy flowers are primarily designed to attract insect pollinators it does not release the large quantities of fine airborne pollen associated with wind-pollinated trees like olive, mulberry, or ash. Mild symptoms including sneezing, runny nose, itchy eyes, and skin irritation have been documented in sensitized individuals, but it is not a recognized primary allergen in Arizona’s clinical testing panels. No formal allergen proteins have been characterized for _Lagerstroemia indica_ pollen, and no food cross-reactivity has been established.

In Arizona landscapes, Crape Myrtle blooms reliably from summer through early fall, a season when few other ornamental trees are flowering, and its cultivar range is exceptional, spanning from 2-foot dwarf shrubs to 30-foot tree forms in colors from white and pale pink to deep red and purple. Powdery mildew can be a concern in humid microclimates; selecting _L. indica_ × _L. fauriei_ hybrid cultivars such as ‘Natchez,’ ‘Tuscarora,’ or ‘Sioux’ provides improved disease resistance. For allergy-sensitive homeowners, Crape Myrtle represents a reasonable choice, especially compared to higher-allergen alternatives, though native low-pollen trees like Desert Willow or Chitalpa offer comparable summer bloom with even less allergy risk.