Floral and Nursery Plants Research Unit, U.S. National Arboretum  
   Information on research activities at several locations, development of new plant varieties, and development of new technologies for agriculture, the florist and nursery industries, and home gardeners.
   http://www.usna.usda.gov/Research/

Yosef Mizrahi's Homepage.  
   Biological and horticultural aspects of wild and rare fruit and nut trees of warm climates. Biology of cacti. Abnormally-ripening-fruit mutants.
   http://www.bgu.ac.il/life/mizrahi.html

Sydney Postharvest Laboratory  
   Serving the fresh fruit and vegetable industry, for matters including evaluation of postharvest technologies, storage and handling software, assistance with commercialization, patents, expert testimony, and cargo loss. Located in Sydney, Australia.
   http://www.postharvest.com.au/

Australian New Crops Project  
   Encouraging the commercialisation of potential new crops (including herbs, spices, and other horticultural crops) in Australia. Includes newsletter and links.
   http://www.newcrops.uq.edu.au/

Henry Doubleday Research Association.  
   The HDRA researches and promotes organic gardening in the UK.
   http://www.hdra.org.uk/

The Center for Urban Horticulture  
   Conducts research, teaching, and public service on the selection, management and role of plants and ecosystems in the urban environment. At College of Forest Resources, University of Washington, Seattle.
   http://depts.washington.edu/urbhort/

Horticulture Research International Association  
   Research for commercial horticultural businesses. UK based body with individual and corporate membership.
   http://www.hri.ac.uk/hria/index.htm

Horticultural Engineering  
   Contains information about aspects of engineering, including glasshouse construction and energy conservation, from Rutgers University.
   http://aesop.rutgers.edu/~horteng

Horticulture Resources  
   Information about the horticultural technology with links to the Journal of Applied Horticulture, and horticultural societies.
   http://www.horticulture-india.com

The Horticultural Taxonomy Group  
   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.
   http://www.hortax.org.uk/

The American Society for Horticultural Science  
   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.
   http://www.ashs.org/

Horticulture Solutions Series  
   A collection of short notes on a number of horticultural topics.
   http://www.ag.uiuc.edu/~robsond/solutions/hort.html

Gardenet  
   Online horticultural information service. Australia.
   http://www.gardenet.com.au

The Geophyte Page  
   Information on herbaceous plants with underground storage organs such as bulbs, corms, and tubers. Oriented primarily towards commercial growers, forcers, and retailers. Production statistics, crop specific guidelines for major geophytic plants such as
   http://virtual.clemson.edu/groups/hort/sctop/geophyte/webpage.htm

Home Horticulture  
   Extensive alphabetized listing of horticultural fact sheets and images. Grouped by type of plant and topic. Michigan State University.
   http://www.msue.msu.edu/msue/imp/mod03/master03.html

Institute of Vegetables and Ornamental Crops  
   The Institute carries out basic and applied research supporting the sustainable production of vegetable and ornamental plants and the rational use of natural resources. Located approximately 20 km south of Berlin, the Institute was a research center for
   http://www.igzev.de

Nursery Extension  
   Links and online resources for the nursery industry, from the Clemson University Extension.
   http://www.clemson.edu/hort/nurseryex.html

NC State Horticulture  
   Teaching, research, and outreach in horticulture, including basic biology, ecology, production and use of horticultural products.
   http://www.cals.ncsu.edu/hort_sci/

International Society for Horticultural Science  
   Includes general and specific scientific information, links to journals, events calendar.
   http://www.ishs.org/

International Cultivar Registration Authorities  
   Information on the distinct authorities, how to chose and register a name, symposia and calendars.
   http://www.ishs.org/icra/index.htm

Technical Manual on Small-Scale Processing of Fruits and Vegetables  
   Examines the socioeconomic benefits and effects on rural development of small agroindustrial enterprises in Latin America and the Caribbean. Used as a guide for the activities that the United Nations FAO carries out in these areas.
   http://www.fao.org/DOCREP/x0209e/x0209e00.htm

Controlled Environment Agriculture Center, University of Arizona  
   Details of the center, and of growing crops by protected cultivation.
   http://ag.arizona.edu/ceac

Weed Control in Nursery Crops  
   Discussions on weed control, weed identification, and herbicide management in nursery crops. From Oregon State University.
   http://oregonstate.edu/dept/nursery-weeds/

PlantAmnesty  
   Information on quality gardening and landscaping practice, especially with regard to pruning of shrubs and trees.
   http://www.plantamnesty.org/

Tocklai Experimental Station  
   Research site of the Tea Research Association, India. Information and research on tea cultivation and processing.
   http://www.tocklai.org/

Upasi Tea Research Foundation  
   Information on tea cultivation and growing in the south of India.
   http://www.upasitearesearch.org/home.html

Comprehensive Listing of Alternate and Botanical Names for Horticultural Crops - Sydney Postharvest Laboratory  
   Searchable by common names, alternate names and botanical names.
   http://postharvest.com.au/Alternate_Search.htm

Ecocrop  
   Database interface that identifies suitable plants for a specified environment, for a defined use, or for a defined description.
   http://ecocrop.fao.org/

Agribusiness Online Crop Guides  
   Production and postharvest technical information for individual crops.
   http://www.agribusinessonline.com/crops/

Traditional Pacific Island Crops  
   AgNIC guide to web resources. Includes information on cultivation, marketing, harvest, nutrition, recipes, and trade associations
   http://libweb.hawaii.edu/libdept/scitech/agnic/

Hazelnut Production  
   Plant information and production information with emphasis on Australia.
   http://www.agric.nsw.gov.au/reader/deciduous-fruits/h3149-hazelnut-production.htm

Hort Extension  
   Archive of horticultural information for producers and gardeners from Texas A&M and the Texas Extension Service. Features publications, newsletters, information about specific plants, IPM, and master gardener programs.
   http://aggie-horticulture.tamu.edu/extension/

Hops Information  
   Information, including FAQs and research, on growing hops in eastern United States.
   http://www.uvm.edu/~pass/perry/hops.html

Maca  
   Information on the cultivation of Lepidium meyenii, or Maca.
   http://www.intimaca.com/cultivated.htm

Horticulture Research International  
   Principal UK organisation tasked with carrying out horticultural research and development and transferring the results to industry. Site provides details of research across horticultural sectors.
   http://www.hri.ac.uk/