Plant species and species variants to be used in range restoration work must be able to establish and maintain themselves under a variety of climatic and edaphic conditions. Only adaptable sources or strains should be used to insure successful plantings. One good way of determining the suitability of plant species is to seed them in trial plots over a variety of site conditions. There are no better places to do this than within extended areas that have been prepared for seeding. Sites within these larger areas can be reserved for species testing. While it will not greatly help the seeding underway, such trials should prove extremely helpful in future seedings. After a period of a few years, it is easy to see from such trials the best suited entries and their relative merit can be quickly judged from inspection. Data from these trials may be subjected to considerable detailed statistical analyses, and in some instances this may be warranted. The following outlines a way to quickly assess adaptation.