If your Christmas pine is still standing (and shedding) in your home, this is your chance to give it back to nature at the city park's annual event. Drop off your tree at one of the multiple sites in each borough and watch as it transforms into mulch that will help nourish plants across the city. You can even take home a bag of free mulch for your own garden or to make a winter bed for a tree on your street (during Chipping Weekend on Jan 12 and 13). Learn more here. All ages.