Bulletin #2266, Maine Forage Facts: Orchardgrass (PDF) By Jaime Garzon, Assistant Extension Professor and Forage Educator, University of Maine Cooperative Extension For information about UMaine Extension programs and resources, visit extension.umaine.edu.Find more of our publications and books at extension.umaine.edu/publications/. Orchardgrass Orchardgrass. Orchardgrass (Dactylis glomerata L.) is a tall, cool-season grass that grows in clumps or bunches.