Botanical gardens in Belgium

• Arboretum Bokrijk
• Arboretum Het Leen
• Arboretum Kalmthout
• Arboretum Robert Lenoir
• Botanic garden of the university of Ghent
• Botanical garden Leuven
• Geographic arboretum of Tervuren
• Hof ter Saksen
• Meise Botanic Garden
• Plantcol

Institutes and organizations

• ArbNet
• Belgische Dendrologie Belge
• Botanic Gardens Conservation International (BGCI)
• Global Trees Campaign (GTC)
• International Oak Society
• Magnolia Society International
• Open Tuinen - Jardins Ouverts
• The Maple Society
• The Rhododendron, Camellia & Magnolia Group of the RHS
• The Tree Register
• Vereniging van Botanische Tuinen en Arboreta (V.B.T.A.) (Association of Botanical Gardens and Arboreta)

Databases

• American Rhododendron Society Database
• Angiosperm Phylogeny Website
• Flora Online (China, North America, Pakistan, Ecuador...)
• Germplasm Resources Information Network
• Gymnosperm Database
• Hirsutum: a virtual Rhododendron arboretum
• International Association for Plant Taxonomy (IAPT)
• International Plant Names
• Kew, Electronic Plant Information Centre
• List of Names of Woody Plants and Perennials
• Missouri Botanical Garden's VAST (VAScular Tropicos) nomenclatural database and associated authority files
• Monumental trees
• RHS Plant Finder
• Rhododendronforeningen (Danish Chapter of the American Rhododendron Society)
• The Tree Library