Sphagnum moss is green when it is alive. When it dries out, it turns brown. Sphagnum moss is a common ingredient in potting mixes for gardening. It helps provide aeration, according to the University of Connecticut.
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Marie Notnats enjoys learning about new topics and teaching people new skills. She has been writing professionally since 2008. She is a professional horticulturist with a Bachelor of Science degree in horticulture from Brigham Young University. She writes for About.com, Examiner.com, eHow, and assorted gardening blogs.