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The Holden Arboretum, in Kirtland, Ohio, USA, is one of the largest arboretums and botanical gardens in the United States, with over 3,600 acres (1 456 ha), 600 acres (243 ha) of which are devoted to collections and gardens. Diverse natural areas and ecologically sensitive habitats make up the rest of the holdings. The Arboretum's collection includes 9,400 different kinds of woody plants, representing 79 plant families.
Specializing in the woody plants that can be grown in the climate of Northern Ohio, Holden has a number of specimens obtained during wilderness collection trips, particularly to China and Korea near the 40th parallel, areas with a similar climate to Northeast Ohio. Holden is home to two National Natural Landmarks, accessed by guided hikes, and is Midwest representative for The Center for Plant Conservation. Special gardens include the Myrtle S. Holden Wildflower Garden, the Helen S. Layer Rhododendron Garden, and the Arlene and Arthur Holden Jr. Butterfly Garden. The Holden Arboretum also features extensive Crabapple, Lilac, Viburnum and Conifer Collections.
The Arboretum is named for Albert Fairchild Holden, a mining engineer and executive, who had considered making Harvard University's Arnold Arboretum his beneficiary. However, his sister, Roberta Holden Bole, convinced him that Cleveland deserved its own arboretum. Thus Mr. Holden established an arboretum in memory of his deceased daughter, Elizabeth Davis. When he died in 1913 at age 46, Mr. Holden left a trust agreement in which he provided that funds be designated for an arboretum. After a study of possible sites, Roberta Holden Bole and her husband, Benjamin P. Bole, donated 100 acres (40 ha) in Kirtland Township. In 1931 the Cuyahoga County Court of Common Pleas approved establishment of The Holden Arboretum. In December 1988, 75 years after Albert Fairchild Holden's original bequest, the Holden Trust began to benefit the arboretum as he and so many others had envisioned. His permanent endowment, together with the gifts of other contributors and supporters, make possible the development of a truly first-class arboretum.
Maintaining public safety in Holden Arboretum is the responsibility of the Holden Arboretum Police Department (HAPD), a department that provides police services to the Holden Arboretum area. The geographic area that Holden has property within comprises two counties, Lake and Geauga, and 5 townships and municipalities. Operating under the auspices of The Holden Arboretum, the HAPD is integral to Holden's mission of providing an environment that allows the important education, research, conservation and collections to thrive.
The majority of land at The Holden Arboretum is maintained in a natural state. Even though it gives the appearance of being untouched, crucial management decisions are always being made to maintain the diversity and health of these areas.
The goal of natural areas management is to maintain and ultimately increase species diversity of both flora and fauna. In order to preserve our native habitats, plant community surveys are conducted by Holden staff to inventory the composition of the existing flora. Wise management of unique areas such as Bole Woods, Pierson Creek Valley, Stebbins Gulch, and Little Mountain cannot begin until there is an understanding of the plant communities which comprise these areas. To limit damage, areas such as Stebbins Gulch and Little Mountain can only be accessed by visitors on guided tours.
Diseases, pests and human threats have the potential to severely affect our natural areas. In order to reduce their impact these problems need to be monitored and researched. Current critical issues under study include: exploding gypsy moth and deer populations, beech bark disease, and water quality.
The Holden Arboretum hosts a number of special events and exhibits on the grounds, designed to help people connect with and enjoy the outdoors. Annual events include a spring Arbor Day celebration with family activities; and Goblins in the Garden, a family friendly Halloween celebration. Special exhibits have included David Rodgers Big Bugs (2005); The Holden Express Garden Railroad, created by artist Paul Busse (2007); Gnome and Garden, featuring 20 5 foot tall garden gnomes decorated by regional artists (2011) and Vanishing Acts: Trees Under Threat, a traveling exhibit created by the Morton Arboretum.