Gittin 22A

דשקיל ליה ויהיב ליה ניהלה. רבא אמר פסול ⁠– גזרה שמא יקטום.

as he can take the pot with the leaf inside it and give it to her. Rava says that it is invalid. Although it should be valid if he gave her the leaf together with the potted plant, the rabbis instituted a decree that it is invalid, lest one detach the leaf and give it to her. In that case, all agree that a bill of divorce that is fully written while attached is invalid.

עציץ של אחד וזרעים של אחר; מכר בעל עציץ לבעל זרעים ⁠– כיון שמשך, קנה. מכר בעל זרעים לבעל עציץ ⁠– לא קנה עד שיחזיק בזרעים.

§ The Talmud has another discussion with regard to a perforated pot: In the case of a pot that belongs to one person and the plants in it belong to another person, if the owner of the pot sold it to the owner of the plants, then once the owner of the plants pulled the pot, he has acquired the pot, as it is a movable object, which can be acquired via pulling. However, if the owner of the plants sold the plants to the owner of the pot, then the owner of the pot does not acquire the plants until he takes possession of the plants themselves, e.g., by raking or weeding the dirt surrounding them. Since the plants are considered to be attached to the ground, as they are in a perforated pot, they are considered to be part of the ground, which cannot be acquired by pulling.

עציץ וזרעים של אחד, ומכרן לאחר; החזיק בזרעים ⁠– קנה עציץ. וזו היא ששנינו: נכסים שאין להם אחריות נקנין עם נכסים שיש להן אחריות ⁠– בכסף ובשטר ובחזקה.

If the pot and plants belong to one person, and he sold them to another person, then once the buyer took possession of the plants and acquired them, he acquired the pot as well. And this is an example of the principle that we learned in a Mishnah (Kiddushin 26a): Property that does not serve as a guarantee, i.e., movable property, can be acquired with property that serves as a guarantee, i.e., land, through the giving of money, or with a document, or by taking possession. Therefore, once one takes possession of the plants, which are considered to be like land, he also acquires the pot, which is a movable object.