Switchgrass - Alamo (Panicum virgatum), 500 Certified Pure Live Seed, True Native Seed FREE SHIPPING Number of seed is Pure Live Seed, not bulk Species is US Native, not introduced alien We grow the seed so we control quality A 5 to 10 tall native perennial bunch grass, Switchgrass is a warm season grass adapted to a wide variety of soil types, soil moisture, sun exposure, and temperature ranges. Alamo Cultivar plant material is from Live Oak County, Texas and is developed for high yields of biomass, especially for renewable biofuel.