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Then, reading my newest book, "Pocket Bonsai," which, generally
speaking, is the exception that proves the rule in the accuracy of the horticultural info presented (in a book on Bonsai), I read in the section on air layering: "Don't worry about the moss drying out: as the new roots take in moisture, the xylem remains active and will be continually pumping water into the moss!" (!?) I'm not at all sure what this xylem pump is doing BEFORE roots form, but maybe this is one of the reasons my moss says damp enough. (?) I have no idea what the author of the book is talking about. He may be saying that the parent roots of the tree are supplying water to the new roots that are forming in the air-layer; this might be true as long as there are leaves present above the air-layer area to act as transpiration pumps. But I wouldn't count on this; roots won't form on an airlayer unless the area is protected from evaporation, and the best way to make sure the sphagnum (or whatever) is still damp is to check it occasionally and moisten it. Nina |
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