In the wild in Mexico, this Christmas plant, Euphorbia pulcherrima, may grow to a height of 15 feet
... Like other 
plants in the Euphorbia family, they have a milky sap that can give you ... For 
about 8-10 weeks prior to the desired bloom time, put your poinsettia in complete 
darkness for 12-15 hours ... My grandson gave may a white poinsettia Christmas 
2010.