Responsa for Eruvin 184:1

גפנים מותרין גפנים בקטנה מותר לזרוע את הגדולה

the vines are permitted;<span class="x" onmousemove="('comment',' Since the lesser courtyard cannot influence the larger one which remains independent of it.');">¹</span> if vines grew in the lesser one it is permitted<span class="x" onmousemove="('comment',' Even ab initio.');">²</span> to sow in the larger one.<span class="x" onmousemove="('comment',' Cf. supra n. 6. The line of contact between the courtyards being regarded as a doorway to the larger one and, a doorway having the status of a partition, the corn may be sown even in close proximity to the vines (cf. B.B. 26a) . In this case, since they were planed first, the vines also remain permitted (cf. Men. 15a) .');">³</span>

Teshuvot Maharam