Natural History, April 1st, 2004
With the coming of spring and the return of green to the Northern Hemisphere, what better way than the Web to explore the extraordinary process of photosynthesis? If you're lucky enough to cultivate your own garden, you know you must seed on a tight schedule, often dictated by the arrival of the final frost of winter. To find maps showing average annual minimum temperatures in the United States, visit the monthly garden zine (www.thegarden helper.com). Under the title, click on "Garden Encyclopedia," then scroll down until you find the list of links for "USDA Hardiness Zones." On the same page...
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