תלמוד על בבא בתרא 4:3

MISHNAH: He who buys two trees on another’s property did not acquire the land⁵⁶On which the trees stand.; Rebbi Meїr says, he acquired the land. If they grew, he need not cut them⁵⁷Anything that grows from the tree, neither new shoots nor expanding crowns which extend beyond the range they had at the time of sale.. What grows from the stem is his, from the roots⁵⁸A new tree coming out of the earth. is the owner’s of the ground. If they died, he has no land⁵⁹Cf. Chapter 4, Note 79..
If he bought three, he bought the land. If they grew, he has to cut them⁶⁰Anything which will grow into the original owner’s land is no different from trees growing in one orchard and overhanging another owner’s property (Halakhah 2:14).. What grows from the roots is his. If they died, he has the land.