Timothy Grass

Timothy grass is the most studied allergenic grass and is used as the standard reference for grass pollen allergy testing. It originated in Europe but is now widespread across North America as a pasture and hay grass. The allergen Phl p 1 is the primary protein responsible for reactions and is the basis for most grass pollen immunotherapy products.

If you're allergic to timothy grass pollen, you may also react to:

• All other grass species (extensive cross-reactivity)
• Rye grass (very strong)
• Orchard grass

• Timothy grass allergy is the benchmark for grass pollen allergy — most allergy tests use Timothy pollen.
• If you're allergic to Timothy, you're allergic to essentially all northern grass species.
• Grastek (sublingual tablet) for Timothy grass allergy is FDA-approved for home use.