New Orleans has transformed thousands of discarded Christmas trees into a tool for restoring fragile coastal wetlands, helping reduce erosion and strengthen marshes along Louisiana’s disappearing coastline.
The city has been running the initiative for nearly three decades, collecting used natural Christmas trees after the holiday season and placing them in vulnerable marshes instead of sending them to landfills. The trees are bundled together and airlifted by helicopters into selected wetland areas, where they help slow water flow and trap sediment.
In March 2025, nearly 9,000 donated Christmas trees were collected and transported to the Bayou Sauvage Urban National Wildlife Refuge. The operation was carried out in collaboration with the City of New Orleans, the U.S. Fish and Wildlife Service and the Louisiana Army National Guard. Helicopters dropped bundles of 50 to 60 trees at pre-selected locations, while crews adjusted their placement by boat.
The tree bundles act as natural barriers that reduce wave energy and encourage mud and silt to accumulate. As sediment builds up, marsh grasses begin to grow, stabilising the soil and creating habitat for birds, fish, crabs, crawfish and shrimp.
Louisiana has lost more than 2,000 square miles of coastal land since the 1930s due to erosion, rising sea levels, land subsidence and reduced sediment deposits from the Mississippi River. Wetlands play a vital role in absorbing floodwaters, reducing wave impact and protecting nearby communities from storms.
Research published in the journal Ecological Engineering found that Christmas tree barriers can cut wave energy by around 50% in suitable locations and promote sediment accumulation, although scientists note that the method works best as part of broader coastal restoration efforts.
According to refuge officials, the annual programme has restored and stabilised marshland equivalent to nearly 200 football fields, demonstrating how discarded holiday trees can contribute to long term environmental conservation and coastal resilience.