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Summary

Switchgrass is a native, warm-season, perennial, tall grass that reproduces from seed and rhizomes. Switchgrass is categorized as either upland or lowland.  Upland types are typically shorter and generally found on upland sites with lower fertility and drier conditions. Lowland types can reach 8 to 10 feet tall, are very robust, and found in moister low areas with high fertility. Mature lowland types will tolerate long periods of flooding. Switchgrass is a very persistent species with excellent drought hardiness and cold tolerance. Switchgrass is widely adapted and found throughout the United States with the exception of the West Coast. Switchgrass produces large seeds on a spangled-type seed head. The stem is round, hollow, and usually has a reddish tint. Switchgrass is easily identified by a small nest of hair where the blades attach to the sheath. Switchgrass is used for pasture and makes a good quality hay when mowed prior to seedhead formation. It should not be grazed closer than 5 to 7 inches during the growing season. In recent years interest in biofuel research has generated substantial interest in developing new varieties of Switchgrass as well as new management strategies.  For conservation and range use, Switchgrass is usually seeded in mixtures with Bluestem, Indiangrass, and Sideoats Grama. Alamo was originally collected in far south-central Texas on the banks of the Frio River near George West. The Plant Materials Center near Knox City, Texas selected and released Alamo as an improved variety based on superior forage yield, seed production, and improved seedling vigor. Alamo is primarily adapted to regions south of I-70 which intersects Kansas east to west.  Alamo performs best in areas of 25 inches of annual precipitation or when planted in low lying areas in arid climates. Alamo, with good moisture and soil fertility, can reach heights up to 10 feet and produce in excess in of 7 tons of biomass annually.  Alamo performs well on a wide range of soils from clay to very fine sand.  Recommended seeding rates range from 4 to 6 Pure Live Seed pounds per acre.