A tree that was uprooted together with the rock, [or] was swept by a river together with the rock, if it can survive, it is exempt. But if not, it is liable. [If] the rock was dislodged from its side, or [if] the ploughshare jolted it, or if it jolted it and made it as dirt, if it is able to survive, it is exempt. But if not, it is liable.

A tree that was uprooted, but there remained in it a root, it is exempt. And how much must the root be? Rabban Gamliel says in the name of R' Elazar ben Yehudah the man of Bartosa: Like the stretching needle.

[If] a tree was uprooted but had a layer, and it survives from it, then the old [tree] becomes like the layer. [If] he layered it year after year, and it was severed, he counts from the time that it was severed.  An extension of grapevines, and an extension upon an extension, even though he layered them in the ground, it is permitted. R' Meir says: Where its strength is sufficient, [it] is permitted; but where its strength is insufficient, [it] is forbidden. And so too, a fruit-laden layer that was severed, if it increased by [one part] in two hundred, it is forbidden.

. A sapling of orlah, or of kilayim of the vineyard, that became mixed up with [other] saplings, this he may not gather. But if he did gather, it is nullified in two hundred and one, provided that he does not intend to gather. R' Yose says: He may even gather intentionally, and it will be nullified in two hundred and one.