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I have propagated cuttings in water (even for plants where this procedure is not a recommended method) for years and never changed the water, just topped it up as necessary - but once the cuttings have sufficient roots, I pot them up, and then the vessel they were in is thoroughly cleaned before reusing for other cuttings. I have on occasion added one or ...


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The water may work better over time, until bad things grow. The cuttings produce auxins, the plant hormone that causes roots to grow. This does leak out of the cuttings; an old technique for striking difficult cuttings while obeying organic rules is to place a cutting in a group of other cuttings. But once the roots have started, I think it is fine to change ...


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