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הכל מפסיק לזרעים – It is explains in the Gemara of the Jerusalem Talmud (Peah 17a) that the word הכל/all of these – includes a rock hat would pass over the face of the entire field. If it is necessary to uproot the plough from this side in order to place it on that side, one makes a division.

Introduction This mishnah teaches that there is a difference in what divides a field between a field planted with seeds from which crops grow (mostly grain and beans) and a field of trees.

אלא גדר – ten handbreadths high.

All of these divide in the case of a field [planted] with seeds, but in the case of trees nothing divides except a fence. All of the things in the above two mishnayot divide fields that are planted with seeds, but they do not divide fields with trees. The only thing that divides a field of trees is a fence. The reason for this seems to be that fields with trees customarily have large spaces between trees. There is always some fallow land. In contrast, crops such as wheat and barley are grown closely together and hence a fallow patch or a stream would serve to divide the field.

שער כותש – the branches of a tree are called שער. And the explanation is a thick hair crown, i.e., ramifications forming a sort of arbor – that the boughs of the trees combine one with the other above from the fence like these leaves that are caught in the mortar-shaped cavity. [The Gemara asks: Does this mean, like the pestle in the mortar (i.e., the partition is formed by a depression in the ground between the two fields, out of which the fence rises), or does it mean, pressing up (overgrowing) the fence? The ‘hair (ramification) presses, and not the ‘fence presence’, it is evident that it means overgrowing the fence.’].

Should the branches intertwine [on top of the fence], then it does not divide and he gives one peah for the whole field. Even a fence doesn’t divide a field of trees if the branches of the field are intertwined on top of the fence. Since the trees are intertwined with one another, we consider it to be one field.