Paraskaragrihyasutra 2.10.2

2.10.2

oṣadhīnāṃ prādurbhāve śravaṇena śrāvaṇyāṃ paurṇamāsyāṃ śrāvaṇasya pañcamīṃ hastena vā \2\

When the herbs appear, (when the moon stands in conjunction) with Sravana, on the full-moon day of the Srâvana month, or on the fifth (Tithi) of the Srâvana month under (the Nakshatra) Hasta;