Promotes and encourages scientific research and education in horticulture within the United States and throughout the world. Publisher of HortScience, HortTechnology, and the Journal of ASHS.

Gives the history of HORTAX, an association of taxonomists and horticulturists interested in the classification and nomenclature of cultivated plants, member information and links to the archives of HORTAX News.

German research institute based at Hanover University. Site in German and English.

The Institute carries out basic and applied research supporting the sustainable production of vegetable and ornamental plants and the rational use of natural resources.

Includes general and specific scientific information, links to journals, events calendar.

Carries out a wide range of efficacy and residue work on horticultural crops throughout the North Island of New Zealand, and offer off-season research for Northern Hemisphere companies.

Information on quality gardening and landscaping practice, especially with regard to pruning of shrubs and trees.

Searchable database of ornamental and fruit crops, offering photos and characteristics of a large number of plants traded in the Netherlands. English/Dutch/German.