The Compendium of Bheḷa 7.5.1

7.5.1

vasante vā śaradi vā kuṭajāny uddhared bhiṣak | śuciśśuddhaśśiraḥsnātaḥ puṣyeṇāśvayujena vā ||

In spring or in autumn, the physician should harvest kuṭajas, / pure, cleansed, with bathed head, under Puṣya or under Aśvina;