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Summary

Mishna: If one trained vines (the branches) to cover a sukkah, it is possul.

If there was more schach than vine, it is kosher.

If the vines are cut loose from the ground, they are kosher schach.

This is the general rule: Anything that is mekabel tumah (capable of contracting ritual impurity) or doesn’t grow from the ground is possul. Anything that is not mekabel tumah and grows from the ground (the mishna leaves out the point taught by our mishna — it must also be cut loose from the ground) is kosher.

Gemara: Rav Yosef was seated in the presence of his rebbi Rav Huna. He repeated the mishna “If the vines are cut loose from the ground, they are kosher” and he added “but Rav said: They must be lifted up”. This is the principle of ‘taaseh v’lo min ha’asuy’. A mitzvah must be made in a kosher way, it cannot be koshered once it was already set up. The sukkah must be built with kosher schach, it cannot be built with schach connected to the ground and then cut. Therefore it should be lifted after it was cut, and when it gets put down the second time, it was put down as kosher schach.