Sweet Vernal Grass • Anthoxanthum odoratum 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: Perennial grass with short rootstocks and tufted stems has dark green leaves; can grow up to 2 feet high. Environmental factors: Found in … Continue reading Sweet Vernal Grass