City of London

Website: http://www.cityoflondon.gov.uk

Eden Project

Website: http://www.edenproject.com/

English Heritage

Website: http://www.english-heritage.org.uk/

Garden Organic (HDRA: Henry Doubleday Research Organisation)

Website: http://www.gardenorganic.org.uk/

GARLAND: The Garden and Landscape Heritage Trust for the Advancement of Education and Training

GreenSpace

Website: http://www.green-space.org.uk/

Historic Houses Association

Website: http://www.hha.org.uk/

Historic Royal Palaces

Website: http://www.hrp.org.uk/

Institute of Horticulture

Website: http://www.horticulture.org.uk/

Lantra (Sector Skills Council)

Website: http://www.lantra.co.uk/

Landex (Napaeo)

Website: http://www.napaeo.org.uk/

PlantNetwork

Website: http://www.plantnetwork.org/

Professional Gardeners' Guild

Website: http://www.pgg.org.uk/

Royal Botanic Gardens Kew

Website: http://www.rbgkew.org.uk/

Royal Botanic Garden Edinburgh

Website: http://www.rbge.org.uk/

Royal Horticultural Society

Website: http://www.rhs.org.uk/

The National Arboreta

Website: http://www.forestry.gov.uk

The National Trust

Website: http://www.nationaltrust.org.uk/main/

The National Trust for Scotland

Website: http://www.nts.org.uk

The Royal Parks

Website: http://www.royalparks.gov.uk/

The Sir Harold Hillier Gardens

Website: http://www.hillier.hants.gov.uk/