The Compendium of Caraka 1.27.309

1.27.309

śūladhānyaṃ śamīdhānyaṃ samātītaṃ praśasyate/
purāṇaṃ prāyaśo rūkṣaṃ prāyeṇābhinavaṃ &guru//

Grains with awns and grains in pods older than a year are commended; / old grain is generally dry, while newly harvested grain is generally heavy.