Mishnayos Kilayim Perek 6 Mishnah 7

עריס שהוא יוצא מן הכותל מתוך הקרן וכלה – as for example five vines that are planted at the side of the fence, and they do not support/strengthen the entire fence but rather three at the head of corner from this side and two at the head of the second corner from there., and in the middle of the wall, there are no vines, but the two corners of the wall stand.

נותנים לו עבודתו – six handbreadths from here and six handbreadths from there and he sows the rest of the wall, and even though the length of the wall is not four cubits.

ר' יוסי אומר אם אין שם ארבע אמות וכו' – Rabbi Yossi, according to his reasoning, who prohibited in the above chapter (see Tractate Kilayim, Chapter 5, Mishnah 4) regarding the vat for wine-pressing and the ravine/cavity, if there aren’t four cubits there [he should not bring seed there], but here it comes to tell us that you do not say especially with a vat for wine-pressing and a ravine/cavity that are closed from the four directions that Rabbi Yossi requires four cubits, but near the wall that is not surrounded from the four directions, I might say not. But if you only taught it regarding this, I would think that in this alone, that Rabbi Yossi requires four cubits, but regarding a vat for wine-pressing and a ravine/cavity where there isn’t anything there other than a singular vine, I would say it is not necessary. And above (Tractate Kilayim, Chapter 5, Mishnah 4) we wrote that the Halakha is not according to Rabbi Yossi.