The Compendium of Caraka 7.1.9

7.1.9

In that common or arid land, medicines are praised that grow in an area visited seasonally by cold, heat, wind, and water; even; clean; with water flowing to the right; free of cremation grounds, caityas, sacrificial altars, assembly halls, crevices, pleasure-gardens, anthills, and saline soil; strewn with kuśa and rohiṣa grass; having glossy black sweet soil or golden-colored sweet soil; soft; not plowed by a plowshare; and not damaged by other, more powerful trees.