Reference for Bava Metzia 213:6

ואם הוקשו לזרע אפילו דבי כיתנא נמי יש בהם משום גזל מ"ט מאי דאפסיד אפסיד

Rab Judah said to Rabin son of R. Nahman: My brother Rabin! The cress that grows among flax is not forbidden [to strangers] as robbery;<span class="x" onmousemove="('comment',' Because the injury it does to the flax is greater than its value, and the owner is pleased when people tear it out. ');">⁵</span>

Jastrow

Jastrow

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Jastrow