Poinsettias, Holiday Cactus, Christmas Cactus ...
Recent updates to the BostonGardens website include an article on poinsettias as well as a "Seasonal Chores & Observations" entry which describes the difference between a Holiday Cactus and a Christmas Cactus. (Both entries are dated December 3, 2012).
In addition, there are many interesting upcoming events posted by garden clubs and horticultural organizations, such as the Arnold Arboretum.
Take a look if you get a free moment and thank you for your consideration.
Here is a link that might be useful: BostonGardens.com