And I speak of "shock" only in terms of the interval it takes for an aquatic plant to begin sending out new shoots and runners after trimming. From what I have read, this process is regulated by hormones. Shortly after the stem of a plant is trimmed, certain hormones are produced in greater abundance to signal the plant to begin further development. However there is a "signal delay" in hormone production from the time of cutting to the time of development. My though is that if such signaling hormone could be made available at time time of trimming it would expedite the re-development process.