In addition to the dramatic Daffodil Line at the Nichols Arboretum, there is a daffodils field lining the driveway leading to the entrance of the nearby Matthaei Botanical Gardens. The Nichols Arboretum/Matthaei Botanical Garden website will feature both of these attractions as they start to flower.
December 23, 2008: The information below is from the 2008 season.
The University of Michigan, Ann Arbor, Nichols Arboretum website has this to say about the stunning 20,000-strong daffodil line: "Daffodils continue to make their yearly appearance in this art installation from 2004. Susan Skarsgard, a graduate student, imagined a half-mile long line of daffodils marching up and down the Arb's hillsides. Scores of volunteers planted 10,000 bulbs in the fall of 2003 to make this project a reality."
To learn more about the artistic vision behind the daffodil line project, visit the official Imagine/Align website. The video on the site's home page has great footage.
See also: http://www.imagine-align.org/