They are native to Mexico and Central America and often found as outdoor
plants in Florida and, I assume, other warm places as well.
<http://en.wikipedia.org/wiki/Poinsettia>
The Wiki article notes that: "The colors of the bracts are created
through photoperiodism, meaning that they require darkness (12 hours at
a time for at least 5 days in a row) to change color. At the same time,
the plants require abundant light during the day for the brightest
color." My wife tells me that too much street lighting at night will
interfere with the color change.
Chuck Norcutt
On 12/25/2012 1:22 PM, jfwilcox wrote:
> Are poinsettias associated with Yule throughout the world? They are
> sometimes planted as outdoor ornamentals in Hawaii:
>
> http://www.flickr.com/photos/99378213@N00/8306847967/
>
> This is on the church grounds of Ka Ekalekia Ierusalema Hou -- which
> I think means "Church of New Jerusalem".
>
> Best of the holiday season,
>
> Joel W. Molokai, Hawaii
>
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