New Garden Township is a township in Chester County, Pennsylvania, United States, which was organized in 1714. The population was 11,363 at the 2020 census. New Garden is the center of the mushroom agribusiness in southeastern Pennsylvania with a higher concentration of composting, mushroom growing, packaging, and shipping businesses than in any …New Garden Township is a township in Chester County, Pennsylvania, United States, which was organized in 1714. The population was 11,363 at the 2020 census. New Garden is the center of the mushroom agribusiness in southeastern Pennsylvania with a higher concentration of composting, mushroom growing, packaging, and shipping businesses than in any other municipality in the area. It was named for the New Garden Friends' Meeting House, an eighteenth-century brick house of worship of the Religious Society of Friends, within its territorial limits.