1762 R. Forbes (1886) 145 The rapid Spey forms a pleasant Bottom, rich with Corns and nature-Grass.
1811 W. Aiton 291 When they see a field carpeted with rich grasses, or those that grow luxuriant, they say that field produces nature grasses.
1866 W. Gregor (Philol. Soc.) 177 Tack oot yir coo, an' gee 'ir a pluck o' naitir-girs.
1956 7 Sept. He wid hike awa doon tae the haughie at the brig an' cut a gweed cole o' saft natir girse.