Related for Chullin 271:4
מתנות אע"ג דכתב רחמנא ונתן איכא למימר
What then is the significance of 'the tithe of thy corn'? - It excludes what is held jointly with a gentile.
Tosefta Terumot
We do not take terumah from produce [that is harvested] before it is one-third ripe (cf. Hallah 1:3). How do you know if it is one-third ripe or if not? If it is planted and something has sprouted, it is known that it one-third ripe. If it is planted and something has not sprouted, it is known that it is not one-third ripe.
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