Antelope Valley California Poppy Preserve; photo by roger_ipa on Flickr (noncommercial use permitted with attribution / share alike).
Official State Holiday of California
California designated April 6 as California Poppy Day in 2010, and Governor Wilson proclaimed May 13-18 as Poppy Week in 1996 (the state flower is the California poppy). All State Holidays
Excerpt from Senate Bill 944 (37222.12)
(a) April 6 of each year is designated and set apart as California Poppy Day, a day having special significance pursuant to Section 37222.
(b) On California Poppy Day, all public schools and educational institutions are encouraged to conduct exercises honoring the California Poppy, including instruction about native plants, particularly the California Poppy, and the economic and aesthetic value of wildflowers; promoting responsible behavior toward our natural resources and a spirit of protection toward them; and emphasizing the value of natural resources and conservation of natural resources.