- American Horticultural Society
The AHS mission is to educate and inspire people to become successful and environmentally responsible gardeners by advancing the art and science of horticulture.
- Association for Women in Horticulture
An organization for women working in, or hoping to work in, the field of horticulture.
- Australian Institute of Horticulture
A professional association for qualified Horticulturists in Australia, including Landscape designers, educators, writers, and nursery people.
- Calgary Horticultural Society
Information concerning gardening and the unique climate and growing conditions of Calgary.
- Florida State Horticultural Society
Open forum for growers, researchers, producers, urban gardeners, landscapers and associated industries.
- Hardy Plant Society of Oregon
A non-profit volunteer organization for beginning, experienced, amateur, and professional gardeners.
- Hensall Horticultural Society
Dedicated to the ideal that a horticulturist likes to share, create beauty, has pride in the community, and is concerned with the environment.
- Horticultural Society of Maryland
Providing education for all people in the field of horticultural arts and sciences.
- International Crabapple Society
Identifies disease-resistant cultivars for nursery and landscape professionals, as well as the gardening public.
- Iowa State Horticultural Society
Affiliated organizations representing and promoting specific sectors of horticulture.
- Launceston Horticultural Society
Provides information and contact details about the society.
- Massachusetts Horticultural Society
Information about the society and horticulture. Marketplace schedule.
- MSU Cares
Information provided by the Mississippi State University Extension Service and the Mississippi Agricultural and Forestry Experiment Station.
- New Ornamentals Society
Devoted to the study of new and rare ornamental landscape plants. Includes an online source guide and plant encyclopedia.
- Northern Gardener
Home to Northern Gardener Magazine and the Minnesota State Horticultural Society. Features gardening articles, advice, tips, calendar, and resources.
- Northern Plains Botanic Garden Society
Working to establish a botanic garden, conservatory, and arboretum in the Fargo, North Dakota and Moorhead, Minnesota area.
- Ontario Horticultural Association
Providing information for gardeners in Ontario, Canada.
- Parkhill Area Horticultural Society
Open to amateur and professional gardeners.
- Rhode Island Orchid Society
Devoted to orchid culture and appreciation. Activities include monthly meetings, shows, classes, trips, and newsletters. Supporters of Roger Williams Park Botanical Gardens.
- Royal New Zealand Institute of Horticulture
The mission of the RNZIH is to encourage, promote, and improve horticulture in New Zealand.
- San Diego Horticultural Society
Promoting the enjoyment, art, knowledge and public awareness of horticulture in the San Diego.
- Scottish National Sweet Pea Rose & Carnation Society
Society home page with Sweet Pea & Rose trial results, flower show venue & reports.
- Southern Nursery Association
This 100+ year-old trade association has assembled a great resource for horticulture in the 16 southeastern states of the U.S. It includes interactive searches of current members or exhibitors and their products, and over 5,000 pages of horticultural research from the top horticultural researchers.
- The American Boxwood Society
Not-for-profit membership organization devoted to the appreciation, scientific understanding, and propagation of the genus Buxus.
- The Ecological Landscaping Association (ELA)
Advocating environmentally responsible landscaping and horticultural practices by professionals and the public.
- The Geraniaceae Group
An international horticultural club interested in the species of all the genera of the Geraniaceae Family.
- The Mediterranean Garden Society
Resources for gardeners in the Mediterranean basin and similar climate regions.
- The Pennsylvania Horticultural Society
The Society provides a place where all greening enthusiasts can pursue their own particular horticultural interests. Founded in 1827.
- The Royal Horticultural Society
Britain's Gardening Charity, founded in 1804 to encourage the science, art, and practice of horticulture in all its branches.
- The Royal Horticultural Society of Ireland
Member-led society dedicated to promoting the knowledge, skill, and practice of horticulture, arboriculture and floral art. Founded in 1816
- Virginia Green Industry Council, Inc.
Unifying horticulture in Virginia.
- Virginia Nursery & Landscape Association
State trade association for nurseries, garden centers, landscape contractors, landscape designers,growers, interiorscapers, greenhouses working for the common good of the nursery industry in Virginia.
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