From <a href="http://www.ecke.com/poinsettias/cropinformation/">Ecke Ranch</a>
Premier Red pointsettia. 14-hour-long nights triggers their behavior.
Poinsettias, a favorite of backyard gardeners, are now exhibiting their scarlet, petal-like bracts, just in time for the holidays. The onset of 14-hour-long nights triggers their behavior: In San Diego this condition is met just before the date of winter solstice — Thursday, December 21.
Spectacular Sunsets and Sunrises are characteristic of late fall and early winter’s dry spells. You can drive up to Soledad Park in La Jolla or Mount Helix near La Mesa for an all-encompassing view. Or try hiking up to vantage points such as Cowles Mountain in the San Carlos area and Woodson Mountain near Ramona. Don’t forget to bring a flashlight for the trip up or down.