Possible Clues:

• Seasonal decoration
• It may be in a stand during the 12th month (2 words)
• Dec. 25 centerpiece, for many (2 words)
• Form of decoration that has grown over the years
• Under present burdens, one may get in some pot and light up
• Douglas fir, maybe
• One's present arrangements could well depend on it
• Norway spruce, usually
• Present place
• White ___ House