Related for Sukkah 1:4

הִדְלָה עָלֶיהָ אֶת הַגֶּפֶן וְאֶת הַדְּלַעַת וְאֶת הַקִּסּוֹם וְסִכֵּךְ עַל גַּבָּהּ, פְּסוּלָה. וְאִם הָיָה סִכּוּךְ הַרְבֵּה מֵהֶן, אוֹ שֶׁקְּצָצָן, כְּשֵׁרָה. זֶה הַכְּלָל, כֹּל שֶׁהוּא מְקַבֵּל טֻמְאָה וְאֵין גִּדּוּלוֹ מִן הָאָרֶץ, אֵין מְסַכְּכִין בּוֹ. וְכָל דָּבָר שֶׁאֵינוֹ מְקַבֵּל טֻמְאָה וְגִדּוּלוֹ מִן הָאָרֶץ, מְסַכְּכִין בּוֹ:

If he suspended over it a grape-vine, or gourd, or ivy, using them as schach, it is pasul, [what is attached (to the ground) not being kasher as schach]. But if the (kasher) schach was more (abundant) than the others, or if he cut them, it is kasher. [("if the schach was more":) If there were much more kasher schach than vine or gourd, it is kasher. This, if he pressed them down and intermixed them with the kasher schach so that they are not conspicuous. For, the kasher schach predominating, it "cancels them out" when they are intermixed. ("or if he cut them:") Even after he suspended them as schach it is kasher; this, on condition that he move them about after cutting them. For if he does not do so, it is pasul, it being written (Leviticus 16:13): "The festival of succoth shall you make for yourself" — and not from what is already made. That is, when you make it, it must be (from what is) fit for a succah, and not "from what is made," i.e., something pasul, which is not fit for a succah but which you amend, as when you attempt to make it kasher by (merely) cutting it and not undoing it. But moving it about is like undoing it and then using it as schach, lifting one and putting it down, and repeating the process with the others.] This is the rule: Whatever can acquire tumah and does not grow in the ground cannot be used as schach, [to exclude (from use) wooden vessels, flaxen clothing, and mats, which, even though they originate in the ground, cannot be used as schach, since they can acquire tumah.] And whatever cannot acquire tumah and grows in the ground can be used as schach, [it being written (Deuteronomy 16:13): "The festival of succoth shall you make for yourself … from your threshing floor and from your winepress." Scripture speaks of the discards of the threshing floor and the winepress, i.e., what is left over after you have gathered in (the fruits of) your threshing floor and your winepress, such as straws and vines. From them, make a succah.]

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