Johnson Grass
Johnson grass (Sorghum halepense) is a fast-growing perennial grass native to the Mediterranean region but now widespread in many parts of the world, especially in warm and temperate climates. It is considered both an agricultural weed and a potent source of airborne allergens. Its pollen is released during the warm months and can trigger allergic reactions in susceptible individuals, particularly those with seasonal allergic rhinitis or asthma. Johnson grass is part of the Poaceae (grass) family, which includes many cross-reactive species.
Description
Exposure to Johnson grass pollen can lead to symptoms such as sneezing, itchy or watery eyes, nasal congestion, and in some cases, asthma-like respiratory issues.
Pollen from Johnson grass is typically most abundant in late spring through summer, depending on the local climate and growing season.
Yes, Johnson grass shares allergenic proteins with other grasses, meaning individuals sensitized to one grass type may react to others within the same botanical family.
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