SAN DIEGO — The city of San Diego will operate its 37th annual tree-recycling program beginning Dec. 26, collecting trees through Jan. 23. The city will open 16 dropoff locations, including, Kate Sessions Memorial Park at Soledad Road and Loring Street; Mission Bay at SeaWorld Drive and Pacific Highway; Ocean Beach Robb Athletic Field, 2525 Bacon St.; and University City at Swanson Pool, 3585 Governor Drive. The sites are open daily during daylight hours. Yard clippings, Christmas trees and other organic materials are thought to make up as much as 20 percent of waste buried in landfills, said Chris Gonaver, director of the Environmental Services Department (ESD). Even flocked trees — trees with fake snow — will be accepted. The trees are taken to The Greenery at the Miramar Landfill and turned into mulch and compost. Residents who have curbside recycling can recycle Christmas trees with their regular yard waste. It is advised to cut the tree and make it fit into the green recycling bin, said Dennis Williams, ESD spokesman. However, all tinsel and decorations must be removed prior. For a complete list of sites, visit www.sandiego.gov/environmental-services/.