Perhaps you should try some spelling variations:
"prairie corns grasses" » "prairie forest grasses", "prairie dogs grasses", "prairie voles grasses", "prairie forbs grasses", "prairie sown grasses", "prairie co2 grasses", "prairie towns grasses", "prairie dogss grasses", "prairie citys grasses"
"prairie corn grass" » "prairie town grass", "prairie dogs grass", "prairie city grass", "prairie corn grains", "prairie corn grain", "prairie fiorin grass"
"prairie cord grass" » "prairie dogs grass", "prairie city grass", "prairie vole grass", "prairie bird grass", "prairie cord graft", "prairie cord gray"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("prairie corn grass") OR ("prairie corns grasses"))) OR ("prairie cord grass")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"prairie corn grass\") OR (\"prairie corns grasses\"))) or (\"prairie cord grass\"))".
• Removing quotes may allow a broader search: (((( prairie corn grass ) OR ( prairie corns grasses ))) or ( prairie cord grass )).
• Adding a wildcard symbol may retrieve word variants: (((("prairie corn grass") OR ("prairie corns grasses"))) or ("prairie cord grass"))*.