Crocus from Bulb.com -- http://www.bulb.com/springguide98/crocus/
Planting and cultivation, varieties, and photograph.
The Crocus -- http://gardenline.usask.ca/misc/crocus.html
Discussion of different varieties of crocuses and planting considerations, by Brian Baldwin.
Saffron -- http://www.cob.montevallo.edu/macksre/saffronsite.htm
The history and culture of saffron, harvested from fall-flowereing crocus sativus.
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