Mishnah for Chullin 120:1
לר' חנינא בר פפא מהו
what would be the law according to the view of R'Hanina B'Papa?<span class="x" onmousemove="('comment',' The expression 'after its kind' suggests separateness and so implies a prohibition against grafting one kind on to another. Since, however, this is not expressly stated with reference to plants, but they acted so merely of their own accord, it is doubtful therefore whether there is with regard to plants an implied prohibition against grafting.');"><sup>1</sup></span>
Mishnah Kilayim
They may not graft from one tree to another, or from one vegetable to another, or from a tree to a vegetable, or from a vegetable to a tree. Rabbi Judah permits it from a vegetable to a tree.
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