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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 181.

Royal New Zealand Institute of Horticulture - - The mission of the RNZIH is to encourage, promote, and improve horticulture in New Zealand.