Grass-grown

I resisted all pressure to stay for lunch, and I set off at once upon my return journey, taking the grass-grown path by which we had come.

Source: tatoeba (6611009)

I wandered, on a moonlight night, through the grass-grown enclosure within: here I stumbled over a marble hearth, and there over a fallen fragment of cornice.

Source: tatoeba (11747971)

Then came the Great War, the Irish troubles, and the diversion of most of the American traffic to Southampton; the new construction was promptly dropped, and only grass-grown earthworks and cuttings now remain.

Source: wiktionary

There are numerous sheds in the now grass-grown yard, most of which now house threshing machines and farm carts instead of locomotives and rolling stock, although [in] the roofs of some are gaping holes.

Source: wiktionary