פירוש על עבודה זרה 40:12

In all three of these disputes R. Judah allows a Jew to sell a non-Jew various plants attached to the soil (in the land of Israel) as long as he stipulates that the non-Jew will cut the plant down and not take possession of the land. But R. Meir is stricter and rules that the Jew may sell only the cut down product.