From the Department of Sanitation:
The NYC Department of Sanitation will be conducting special collections for mulching and recycling of Christmas trees.
Collections will take place beginning on Wednesday, January 2 through Saturday, January 19, 2013.
Residents are encouraged to put out their discarded trees at curbside as early as possible during the collection period.
DSNY asks residents to remove all tree stands, tinsel, lights, and ornaments from trees before placing them out for collection. DO NOT place trees in plastic bags. Trees will be chipped into mulch that will be distributed to parks, playing fields, and community gardens throughout the city.
New Yorkers can also participate in NYC Parks & Recreation Mulchfest by bringing their holiday trees to designated sites throughout the five boroughs on Saturday or Sunday, January 12 & 13, 2013, from 10 am to 2 pm.
All of the trees will be chipped into mulch that will be used as ground cover to nourish plantings across the City. Before dropping off your tree, please remove all tree stands, tinsel, lights, and ornaments from trees.
Free mulch will be available at Mulchfest locations —bring a bag if you would like to take home some mulch.