||The widespread use of native grasses depends on an inexpensive, reliable supply of seed with dependable growers and known ranges of adaptation. Over the past 60 years, the USDA, Natural Resources Conservation Service, USDA, Agricultural Research Service, State
Agricultural Experiment Stations, and private seed companies have developed cultivars of grasses to restore ecosystems and produce forage and wildlife habitat. Each cultivar has a known production capability in the nursery and seed production field as well as the situation into which it is established. Each cultivar has a known range of adaptation to climate, soil characteristics, hydrology, and stress such as grazing within which it will perform. Knowledge of these adaptations has allowed the effective use of these cultivars beyond the area in which they were originally collected. Since the largest market for the tall prairie grasses is in the Midwest, much
of the cultivar development has occurred in the states from Texas to North Dakota. Knowledge of the cultivarsí adaptations has allowed their use in the eastern part of the United States until more local origins are developed. Recently, ecotypes and germplasm have been released for use in very localized areas.