Flickr is one of the largest photo sharing sites in the world. You can search it for "Creative Commons" photos by using the following address: http://www.flickr.com/search/?q=flower&l=comm&ct=0
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Flickr is one of the largest photo sharing sites in the world. You can search it for photos by visiting [http://www.flickr.com/search/?q=flower&l=comm&ct=0 here]. That link will only show you photos with a creative commons license, which have been tagged with the keyword "flower". You can easily do new searches by typing in any words you want in the search box.
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That address will bring up photos tagged with the word flower. You can then search for other plants and gardening photos as well in that window.
===Mediawiki Commons===
===Mediawiki Commons===
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Another excellent source, with tons of useful photos: http://commons.wikimedia.org/wiki/Main_Page
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Another excellent source, where all the photos are free to use, and there are millions of them! Click [http://commons.wikimedia.org/wiki/Main_Page here]. Again, make sure to copy all the licensing info when you upload a photo.