The Compendium of Bheḷa 7.5.2

7.5.2

pratūṭhāni śucau deśe kuśarohiṣasaṃskṛte | kṛṣṇamṛtsnāprabhe vāpi tathā vā svarṇamṛttike ||

grown in a pure place graced with kuśa and rohiṣa grasses, / having the appearance of black soil, or with golden earth;