פירוש על בבא בתרא 4:8

האבנים שהם לצורכה – to make a fence.

Introduction Mishnah eight discusses what is sold as part of a field.

ואת הקנים – that we tie up the vines with them.

If a man sold a field he has also sold the stones that are necessary to it, and the canes in a vineyard that are necessary to it, and its unreaped crop, and a partition of reed which covers less than a quarter-kav’s space of ground, and the watchman’s hut if it was fastened down with mortar, and ungrafted carob trees and young sycamores. This mishnah lists the things that are sold with a field. Tomorrow, in mishnah nine we will learn a long list of things that are not sold with a field. The list of things that are sold with a field includes things that are a necessary part of the maintenance of the field such as the stones used for fences and the canes used in a vineyard to grow the vines. It also includes the produce still attached to the ground and similarly the watchman’s hut if it was attached to the ground. [Note: there are other versions of this line concerning the watchman’s hut]. It also includes some small, as of yet insignificant trees as well as an insignificant portion of a reed partition. Since these things are not significant in and of themselves they become included as part of the field.

ואת מחיצת הקנים – many canes grow on one stem/stalk when it is less than a piece of ground of the capacity of a one-fourth of a Kab of seed, therefore it is neutralized concerning the field.

שומרה – a guard booth that is attached to the ground with plaster.

ואת החרוב – in its youth when they are not yet engrafted and when they cause damage when they grow strong and it is engrafted, and it has name of its own, and is not neutralized concerning the field.

ואת בתולת השקמה – in its youth before they cut its branches or when it causes damage, we cut the ranches that have grown a great deal in their place, and it is called the trunk of the sycamore tree.