I have a rock covered in it. I have had it for over a year and there is no noticeable growth. It is recently much happier (more extended) than usual, so maybe I will see growth. I hear other people saying similar things. I also heard that placing it at an angle so it is positioned vertically rather than horizontally can help improve growth, but I haven't been able to confirm this.
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~ Mindy
SPS fanatic.
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