Lantana

None documented

Lantana ( _Lantana camara_) is one of the most widely planted summer-color shrubs in Arizona, valued for its vibrant clusters of multi-colored flowers, ranging from yellow and orange to pink and red, and its exceptional heat and drought tolerance once established. Native to tropical Central and South America, it was introduced globally as an ornamental plant and has since naturalized invasively in more than 60 countries, where it is classified as one of the IUCN’s 100 worst invasive alien species. In Arizona, it is present as a naturalized plant in disturbed areas at lower elevations and is documented in the state by EDDMapS. The UA Arboretum describes it as “a widespread and problematic invasive plant with negative effects in over 60 countries globally.”

From an allergy standpoint, Lantana’s primary concern is contact rather than airborne. It is pollinated by butterflies, bees, and other insects so its pollen does not circulate in the atmosphere in clinically significant quantities in landscape settings. The main risk is contact dermatitis and photo-contact dermatitis from lantadene compounds, leaf hairs, and plant sap. ASCIA specifically names Lantana as a cause of photo-contact dermatitis, and UC ANR confirms that “the hairs on the leaves can cause contact dermatitis and minor skin irritation.” Gardeners who prune, deadhead, or handle the plant without gloves are at greatest risk, particularly with prolonged sun exposure. A 2016 immunoproteomics study published in _Allergy, Asthma & Clinical Immunology_ identified IgE-reactive proteins in _L. camara_ pollen, but this was conducted in India where the plant grows as a dominant roadside weed with extremely high pollen loads, a different exposure profile than what exists in Arizona’s managed landscape settings.

All parts of Lantana are toxic to pets and livestock, and the berries in particular are poisonous and should not be planted where children or animals have unsupervised access. For allergy-sensitive or pet-owning homeowners, sterile Lantana cultivars such as ‘New Gold’ and ‘Radiation’ provide the same ornamental value with reduced seed production and lower invasive spread risk. Native alternatives such as Desert Ruellia, Brittlebush, or Desert Marigold offer comparable summer color with no contact allergy or toxicity concerns.