, Prospect Park had 30,000 trees, comprising around 200 unique species. With few exceptions, the trees in Prospect Park were mostly planted manually. In its earliest years, Prospect Park had maintained a nursery of trees and plants, from which over a hundred thousand specimens were eventually taken. Now, Prospect Park Alliance regularly maintains the park's flora, removing invasive species and adding native plants. Prospect Park contains four "great trees" that are specially recognized by NYC Parks. These include a Camperdown Elm south of the Boathouse, among the first planted in the United States; an American Hornbeam and a Japanese Pagodatree located near the Camperdown Elm; and an English Elm along West Drive.