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