Keyword: Plant and garden societies
International Waterlilly & Water Gardening Society
International Society for Horticulture Science
International Society of Arboriculture
International Palm Society
International Lilac Society
International Clematis Society
Holly Society of America, Inc.
Hobby Greenhouse Association
“The Hobby Greenhouse Association is a nation-wide non-profit organization of people who enjoy growing ornamental and edible plants year-round through the use of various structures designed to provide the necessary or optimal environmental conditions for successful plant growth.”
Garden Organic (UK) aka Henry Doubleday Research Association
“Garden Organic, the UK’s leading organic growing charity, has been at the forefront of the organic horticulture movement for 50 years and is dedicated to researching and promoting organic gardening, farming and food.”