Citrus

Other citrus fruits (lemon, lime, orange, grapefruit, mandarin), apple, banana, pineapple, persimmon, cashew, pistachio

Citrus trees, including sweet orange ( _Citrus sinensis_), grapefruit ( _C. paradisi_), and lemon ( _C. limon_), are among the most widely grown residential landscape trees in Arizona, particularly across the Phoenix metro area, the Tucson basin, and the Yuma agricultural corridor. Historically, Mesa and the surrounding East Valley were covered in thousands of acres of commercial citrus groves, and while much of that acreage has been converted to housing, citrus remains one of the easiest and most rewarding edible trees for Arizona homeowners. The intensely fragrant spring bloom is one of the signature scents of the Valley of the Sun.

From a pollen allergy standpoint, citrus trees are among the safest choices available in Arizona. They are pollinated entirely by bees and other insects, not by wind, meaning their pollen is heavy, sticky, and not dispersed in the air. As City Farming’s Arizona Citrus Guide states directly: “Citrus trees are pollinated by bees, not by wind, so pollen is not an allergy issue.” Stallergenes Greer notes that the flowers “may cause an allergic reaction in some patients,” but this is generally a fragrance-triggered irritation and is most likely to affect individuals with scent sensitivities rather than true seasonal allergies.

The more clinically relevant concern with citrus is food allergy rather than pollen exposure. Citrus fruits share profilin isoforms (Cit s 1 and Cit s 3) with apple, and cross-reactivity across the citrus genus is well established, patients sensitized to orange may react to lemon, lime, grapefruit, or mandarin. Grass pollen-sensitized individuals can develop citrus food cross-reactivity via shared profilin proteins. Cashew and pistachio cross-reactivity has been documented specifically in patients with orange seed sensitization. Importantly, some patients react to citrus seeds but tolerate pulp and juice, a nuance worth discussing with an allergist. Arizona homeowners with known citrus food allergies should consult a specialist for individualized guidance on fruit handling and consumption.