Reply Instead of leaving your Christmas tree on the sidewalk after the holidays this year, there's a less wasteful way to dispose of the used-up conifer: drop it at one of the city's dozens of mulch sites. (David Allen/Patch) WASHINGTON HEIGHTS, NY — Instead of leaving your Christmas tree on the sidewalk after the holidays this year, there's a less wasteful way to dispose of the used-up conifer: drop it at one of the city's dozens of mulch sites. This year, "Mulchfest 2021" runs from Dec. 26 to Jan. 9. It includes tree drop-off sites around Manhattan, where the Parks Department will take each tree and break it into wood chips to nourish city parks.