For a winter holiday treat, try the vividly illustrated pages from the American Phytopathological Society on the poinsettia and its history and diseases. The Web site begins with the tale of how a Mexican beauty of limited range grew into the United States’ best-selling flowering plant. Subsequent pages document the abundant spots, rots, and other ills that menace a holiday display. Playing doctor has rarely been so colorful.
Go to: http://www.apsnet.org/online/feature/xmasflower/
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