(Mishnah): If one who causes his vine to spread over his neighbor's produce, he prohibits it and he is responsible for it.

(R. Yosi and R. Shimon): A person cannot prohibit that which is not his.

(R. Yosi): It once happened that a person planted seeds in his vineyard in Shevi'is and R. Akiva ruled that a person cannot prohibit that which is not his. (Since in Shevi'is, his land is not considered his, he cannot prohibit it through planting Kilayim.)

(Gemara): The pasuk states (Devarim 22:9), "Do not plant Kilayim in your vineyard (together with) a mixed variety of species, (lest the increase, even the seed that you plant and the product of the vineyard become forbidden).'' This only teaches about your own vineyard; but what about another's vineyard? The (end of the) pasuk says, "the vineyard''

(R. Elazar): (The phrase 'another's vineyard' implies that one also may not plant in the vineyard of a gentile). This follows the view of R. Meir that the acquisition of land in Eretz Yisrael of a gentile does not exempt it from tithes.

(R. Yochanan): This follows both opinions. (Even though there is no prohibition of Kilayim if a Jew planted in the vineyard of a gentile, but if the Jew then buys the vineyard, there's a prohibition for him to allow them to continue growing.)

R. Yona and R. Yosa both said that it follows the view of R. Meir.