Reference for Chullin 231:11

אמר אביי

Now only if it increased [by a two-hundredth part] is it [forbidden], but if it had not increased it would not<span class="x" onmousemove="('comment',' It is evident from this that the diverse kinds sown (even after they have taken root) are not forbidden, but only if there was an increase in the one by reason of the other.');">⁶</span>

Jastrow

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