An arboretum (Latin arbor "tree" ) is a collection (not in planters growing ) of various, often exotic trees and shrubs; this can be for example a botanical garden where mainly trees and shrubs will be planted. One speaks of a " fruticetum " if only shrubs will be planted. If only Conifers planted in an arboretum, it is called " Pinetum ".

After the eleventh edition of the Encyclopædia Britannica of 1911, the term was first used by John Claudius Loudon in 1838 in a book about trees.

An important, rich in rare, even foreign trees - today under gone - for study purposes Arboretum created soon after in Germany Eduard Petzold as Park Director of Prince Wilhelm Friedrich Karl of Orange- Nassau in Muskau (see his writing Arboretum Muscaviense ).

As the oldest arboretum in the world is considered the Arboretum of Trsteno near the city of Dubrovnik in Croatia, which should exist since 1492.

The largest area today, forest science -driven Arboretum in Germany is located in the state forest timber castle on the city of Wuppertal, North Rhine-Westphalia. There woody plants from three continents are examined for their environmental impact and their growth behavior in the Central European climatic zone to approximately 250 hectares.

In Bad ground on the edge of the Harz Lower Saxony operates since 1975 on approximately 100 acres of a test facility with about 600 source- backed wood species, to observe their growth properties. The Arboretum Bad Grund belongs to the jurisdiction of the Forestry Department Riefensbeek. The Arboretum is open to the public, and especially in the fall through the intense foliage a tourist attraction.

In Ellerhoop is an arboretum of over 4,000 trees and plants located on 17.3 acres.

An originating from the time of Austria-Hungary Arboretum is located in Arco, Trentino (formerly of Trento ). The northern Polish Arboretum Wirty founded in 1875 and went out of the West Prussian Royal Forestry Wirthy.

In the French part of Switzerland, in Aubonne is the first arboretum, Switzerland, founded in 1963. The Arboretum is open all year to the public, since 2002, is also located here, the Swiss Library for Dendrology

In the Ruhr area, in the south of the inner city, there is the Romberg Park, an old botanical garden and landscape park.

See list of arboretums