Rhododendra is an online rhododendron database that helps enthusiasts explore species and hybrids documented by contributors around the world. Its searchable plant index brings together thousands of entries, with photographs and information about individual plants, including details such as parentage where available. Visitors can search not only for rhododendrons, but also for hybridizers and botanists associated with them, making the site a resource for discovering the people and work behind the plants.

The website also features a Hall of Fame, contributor and donor listings, and links to related resources. Its community-oriented content is supported by contributions from people across the globe, and visitors can sign in or donate to support the database. Rhododendra provides information about the site through its About, Legal, Update Log, and Technical Details sections. Required cookies support functions such as sign-in and forms, while optional analytics help assess page use. With its combination of plant records, images, and search tools, Rhododendra offers a focused reference for learning about rhododendron diversity and cultivation history.