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 regarded both as an agricultural weed and a significant source of airborne allergens. Its pollen is released during the warmer months and can provoke allergic reactions in susceptible individuals, particularly those with seasonal allergic rhinitis or asthma. Johnson grass belongs to the Poaceae (grass) family, which includes many cross-reactive species.
Description
Exposure to Johnson grass pollen can cause symptoms such as sneezing, itchy or watery eyes, nasal congestion, and, in some cases, asthma-like respiratory problems.
Pollen from Johnson grass is usually most plentiful from late spring through to summer, depending on the local climate and growing season.
Yes, Johnson grass shares allergenic proteins with other grasses, meaning individuals sensitised to one grass type may react to others within the same botanical family.
