Cedars Park contains a mature and diverse collection of trees from around the world. Between 2019 and 2021, volunteers from the Friends of Cedars Park identified and numbered all of the main trees in the park, allowing people to easily see the species of each tree.

CPRE Hertfordshire said: 'The tree project is a valuable asset helping visitors to discover the trees in the park. Their species lists and measurements . . . have contributed to our national knowledge of trees in cultivation'.