My highschool has a green house and in a class I am taking we take cuttings from plants and grow them into more plants. We cut off a piece that has two or three leaves on it and then dip the end into some plant hormone. Then we put the plants into trays of really wet perlite. Within a month the cuttings had very large root systems. I do not know if you would be able to do this without plant hormone which is a little expensive but its worth a try. Putting the cutting back into just regular potting soil might work.

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