Forage grass and legume performance varies depending on environmental conditions. No single forage type or variety is best in all environments. The adaptation of a species or its potential longevity in the filed, is determined greatly by genetic cold-hardiness traits, and its tolerance of other site, soil, and use conditions.

When selecting a forage species, or several species for use in a seed mixture, first consider their appropriateness for the intended use (pasture, hay, etc.) and for the expected longevity on the site.

Among the other factors that affect the suitability of a forage species are: drought tolerance, soil pH level, fertilizer nutrient requirements, soil damage, intensity, and harvest or grazing.