Lyon Arboretum is a botanical garden and research facility located in Manoa Valley in Honolulu, Hawaii. The arboretum is part of the University of Hawaii at Manoa and is managed by the university’s College of Tropical Agriculture and Human Resources.

The arboretum covers an area of 200 acres and features a diverse collection of over 5,000 plant species from tropical and subtropical regions around the world. The collections include palms, heliconias, gingers, bromeliads, and other tropical plants.

In addition to its collections, Lyon Arboretum also serves as a research facility for the study of tropical plants and ecosystems. Researchers from around the world come to the arboretum to study plant biology, ecology, and conservation.

The arboretum is open to the public and offers a range of educational programs and events, including guided tours, workshops, and classes on plant cultivation and conservation. It is also a popular destination for hiking and nature walks, with a network of trails that wind through the lush tropical forest.