New Zealand Arboricultural Association
A professional organisation championing best practice in Arboriculture and representing the interests of the New Zealand Tree Care Industry.
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Royal New Zealand Institute of Horticulture
The RNZIH is an organisation with a long history of supporting the development of horticulture in New Zealand.
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New Zealand Gardens Trust
The most comprehensive source of New Zealand gardens open to the public.
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Heritage New Zealand
Heritage New Zealand is this country’s leading national historic heritage agency and guardian of Aotearoa New Zealand’s national heritage.
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The Tree Council (NZ)
The Tree Council is a long-standing non-profit organisation established in 1986 to act as a steward for the trees of the Auckland region.
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Native Eastern Tree Society
ENTS is the premiere tree measuring group of the eastern U.S. forest. ENTS is a discussion forum for people who view trees and forests not just as a crop to be harvested, but also as something of value in their own right. Membership is open to anyone with an interest in trees living anywhere in the world.
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Australian National Register of Big Trees
Australia's largest trees of a particular species are recorded in this Register. The register is an integrated list of Australian indigenous and naturalised trees.
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Californian Register of Big Trees
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The Tree Register of Ireland
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USA National Register of Big Trees
Since 1940 citizens have helped American Forests find the largest of 826 species of trees in the US those champions are listed on the National Register of Big Trees.
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The UK Tree Register
A unique record of Notable and Ancient Trees in Britain and Ireland.
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The Gymnosperm Database
A scientifically accurate source of information on the classification, description, ecology and uses of this culturally and ecologically important group of plants
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SCION National Forestry Herbarium
This herbarium specialises in cultivated tree species associated with forestry and amenity planting, and includes extensive collections of eucalypt and pine species. It holds over 26 500 catalogued specimens. Data from the whole collection (including photographs of each species) is searchable online.
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Giant Trees - Tasmania's world class forest giants
A website that celebrates Tasmania's Giant Trees, the world's biggest hardwoods, and tallest flowering plants.
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Key to NZ Cultivated Pines
This is an interactive, web-based identification key to 90 species of cultivated pines with over 300 photographs of foliage (needles), buds, cones and other features. It uses Lucid software and offers 43 features including characteristics of foliage, cones, branchlets, buds, seeds, bark and habit.
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A professional organisation championing best practice in Arboriculture and representing the interests of the New Zealand Tree Care Industry.
The RNZIH is an organisation with a long history of supporting the development of horticulture in New Zealand.
The most comprehensive source of New Zealand gardens open to the public.
Heritage New Zealand is this country’s leading national historic heritage agency and guardian of Aotearoa New Zealand’s national heritage. 
The Tree Council is a long-standing non-profit organisation established in 1986 to act as a steward for the trees of the Auckland region.
ENTS is the premiere tree measuring group of the eastern U.S. forest. ENTS is a discussion forum for people who view trees and forests not just as a crop to be harvested, but also as something of value in their own right. Membership is open to anyone with an interest in trees living anywhere in the world.
Australia's largest trees of a particular species are recorded in this Register. The register is an integrated list of Australian indigenous and naturalised trees.
Since 1940 citizens have helped American Forests find the largest of 826 species of trees in the US those champions are listed on the National Register of Big Trees.
A unique record of Notable and Ancient Trees in Britain and Ireland.
A scientifically accurate source of information on the classification, description, ecology and uses of this culturally and ecologically important group of plants
This herbarium specialises in cultivated tree species associated with forestry and amenity planting, and includes extensive collections of eucalypt and pine species. It holds over 26 500 catalogued specimens. Data from the whole collection (including photographs of each species) is searchable online.
A website that celebrates Tasmania's Giant Trees, the world's biggest hardwoods, and tallest flowering plants.
This is an interactive, web-based identification key to 90 species of cultivated pines with over 300 photographs of foliage (needles), buds, cones and other features. It uses Lucid software and offers 43 features including characteristics of foliage, cones, branchlets, buds, seeds, bark and habit.