Related for Bava Metzia 176:6
מתיב מר זוטרא בריה דרב נחמן גורנו למעשר לחייב עליו משום טבל משתגמר מלאכתן ואיזהו גמר מלאכתן מלאכת הכנסתן מאי לאו הכנסתן אפילו בשדה
And R. Assi interpreted this: As soon as their blossoms are shed. Now, does that not mean, as soon as their blossoms are shed even in the field?<span class="x" onmousemove="('comment',' Though they have not yet faced the courtyard or the house. ');"><sup>6</sup></span>
Tosefta Maasrot
The "granary" for tithes [of produce] (i.e., the point at which produce must be tithed) rendering one liable on account of the laws of tevel (i.e., the prohibited consumption of or benefit from untithed produce), is once their work is completed -- [meaning] the work of being brought in [from the field]. (See Bava Metzia 88b:6).)
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