Arboretums Worth Visiting Around the World
An arboretum is, at its simplest, a collection of trees. In practice, the great arboretums of the world are anything but simple — they are decades or centuries of deliberate planting, accumulated scientific knowledge, and horticultural expertise, laid out across landscapes that can span hundreds of hectares. Visiting a well-maintained arboretum is one of the most immersive ways to understand tree diversity, to see how different species respond to the same climate, and to encounter specimens you would otherwise need to travel across continents to find growing wild.
The ambition of arboretum founders has historically been encyclopaedic — to grow as many species as possible in one place. The practical result is that major arboretums often hold living collections that represent a significant fraction of the world's tree species, making them irreplaceable for research into traits like drought tolerance, disease resistance, and phenological response to climate change. Many function simultaneously as public gardens, research institutions, and conservation gene banks.
Arnold Arboretum, Boston, Massachusetts, USA
Established in 1872 and designed in partnership with Frederick Law Olmsted, the Arnold Arboretum in Jamaica Plain covers 107 hectares and contains approximately 15,000 plants representing over 4,000 different kinds of woody plants. It is managed by Harvard University as a research institution and is free to visit. The lilac collection — one of the world's largest, with more than 400 varieties — draws visitors from across New England each May. The collection of Asian maples, crabapples, and oaks is particularly strong, reflecting early collecting expeditions to East Asia.
Westonbirt, The National Arboretum, Gloucestershire, England
Westonbirt was planted from 1829 by Robert Holford and then continued by his descendants before coming under Forestry England management. It covers 243 hectares and holds around 15,000 trees and shrubs from across the temperate world. The autumn colour at Westonbirt is among the best in Britain, with Japanese maples, North American oaks, and tupelos providing spectacular reds and oranges from late September through November. The old arboretum section contains trees dating from the original nineteenth-century planting, some now of national champion status.
Nong Nooch Tropical Botanical Garden, Chonburi, Thailand
Southeast Asia's most extensive arboretum-style garden, Nong Nooch covers 500 hectares and specialises in tropical trees, palms, and cycads. The cycad collection is internationally significant — one of the largest living collections in the world — and the palm collection spans families from across the pantropical zone. Nong Nooch also functions as a horticultural showpiece, with themed garden sections including French formal and European topiary areas, though it is the tropical tree diversity that makes it of particular scientific interest.
Correvon Arboretum, Jussy, Geneva, Switzerland
Less well known internationally than some entries on this list, the Arboretum de Correvon near Geneva is a hidden gem. It specialises in species particularly relevant to European forestry and conservation, with a strong collection of oaks, elms, and other broadleaf species under threat from disease or climate change. The elm collection is notable given the near-extinction of many European elm species from Dutch elm disease; Correvon holds disease-resistant material from breeding programs.
Arboretum Sofievka, Uman, Ukraine
Sofievka, established in 1796, is one of Europe's oldest surviving designed landscapes and includes a substantial tree collection within its broader park design. The original planting featured exotic trees brought from across Europe and Central Asia, and many of these original specimens survive, giving the arboretum a historical depth that more recent collections cannot match. The combination of romantic landscape design and mature specimen trees makes Sofievka an exceptional destination for those interested in both garden history and dendrology.
Arboretum de Chevreloup, Versailles, France
The Arboretum de Chevreloup forms part of the broader estate of the Palace of Versailles but receives far fewer visitors than the main gardens. It is managed by the National Museum of Natural History and covers around 200 hectares with a collection of roughly 2,500 species. The oak collection — one of the richest in France — includes species from North America, Asia, and the Mediterranean region alongside European natives. Access requires advance booking, which keeps visitor numbers manageable and makes the experience feel more like a genuine scientific site than a tourist attraction.
Batsford Arboretum, Gloucestershire, England
Batsford in the Cotswolds was planted from the 1880s by Lord Redesdale, who had served in the British diplomatic service in Japan and returned with a passion for Japanese garden design and East Asian plants. The Japanese influence is visible throughout in the planting style, the bronze statues, and the selection of species. The collection of Japanese maples is outstanding, as is a significant bamboo grove. The site covers around 56 hectares on sloping ground that creates varied microclimates, allowing species with different drainage and aspect requirements to coexist.
Pinetum at Bedgebury, Kent, England
Bedgebury National Pinetum, established jointly by the Royal Botanic Gardens at Kew and the Forestry Commission in 1925, is the most complete collection of conifers in the world in terms of genera represented. It covers 320 hectares and holds specimens of virtually every conifer genus known to science, including extremely rare species from China, Taiwan, Vietnam, and Central America that are threatened or endangered in the wild. Bedgebury's research role in documenting how conifers respond to climate shifts makes it one of the most scientifically active arboretums operating today.
Hoyt Arboretum, Portland, Oregon, USA
Hoyt Arboretum sits within Forest Park in Portland and covers around 80 hectares on steep terrain. It holds more than 6,000 specimens from approximately 2,300 species, with a particular strength in conifers from the Pacific Rim — fitting given Oregon's position within one of the world's great conifer forests. The redwood grove, the magnolia collection, and the exceptional winter garden (which provides interest through bark colour, structure, and early-flowering shrubs) make Hoyt a year-round destination.
Practical Notes for Arboretum Visitors
The most rewarding arboretum visits are those timed to a specific seasonal event — maple colour in autumn, flowering cherries and magnolias in spring, or winter structure and bark in the colder months. Carrying a field guide or using a tree identification app significantly enhances the experience. Most major arboretums produce printed or digital maps that identify notable specimen trees, and many now use QR code labels on landmark trees for instant access to species information.
Explore the map to find arboretums near your location or plan an itinerary that takes in multiple collections across a region.
The value of arboretums extends well beyond recreation. As climate pressures reshape which tree species are viable in different regions, arboretums that have been systematically recording survival, growth, and phenology data for a century or more hold information that forest managers and conservationists urgently need. The tree standing in front of you in a well-managed arboretum may be contributing data to decisions about which species to plant in reforestation programs across the coming decades.