3,071. A Vine Extended Into the Ground

Hilchos Kilayim 6:6

Let’s say that someone planted his field with vegetables or grain, but then he changed his mind and decided to plant vines there instead. In such a case, he must turn over what he planted with a plow, after which he can plant the vines; he may not plant the vines and then turn over what he planted. If he planted his field with vines and then changed his mind to plant seeds there, he must uproot the vines, after which he can plant the seeds. If he wants to cut the vines until less than a handbreadth of them remains near the ground (<3"), he may then plant and uproot the rest of the vines after.

Hilchos Kilayim 6:7

Let’s say that someone extends a vine in the ground, even enclosed in a cylinder made from a dried gourd or earthenware. If there are three or more handbreadths of soil (about 9”) covering the vine, he may plant over it. If there’s less soil than that covering it, he may not plant over it but he may plant to the side of it.