Poinsettia is a short-day plant that produces red bracts in the winter. It is native to Central America but commonly grown indoors in USDA plant hardiness zones 9-10. Poinsettias are forced to bloom for the Christmas season by controlling light exposure and temperature in greenhouses. Large growers take cuttings in the summer from stock plants and provide shortening day lengths to trigger color changes before shipping to retailers in late fall. Proper care involves pest management and maintaining temperatures between 60-80 degrees Fahrenheit to have plants ready for sale by early December.