When Shmuel allowed the patches to be planted side by side, the Gemara asked “But the leaves intermingle!”. Why doesn’t the Gemara simply ask from the fact that the two parallel rows are only separated by two tefachim – which is inadequate?
Rav Yochanan allows the (filled) round patches to be planted side by side, apparently by employing the concept of ‘Rosh Tur’ – since each patch is independently regarded. But the Gemara concludes that we will only apply ‘Rosh Tur’ to a patch shaped as a square – how is this compatible?