Johnson Grass • Sorghum halepense Grasses Conditions: Allergic rhinitis; allergic asthma; allergic conjunctivitis. Symptoms: Itchy, stuffy, or runny nose; post-nasal drip; sneezing; itchy, red or watery eyes; asthmatic symptoms. Physical description: Grows between 2-7 feet tall, long, broadleaf blades; flower head is large, open, well-branched, dark reddish, or purplish-brown. Environmental factors: Very common; found in … Continue reading Johnson Grass