British Pelargonium and Geranium Society
   Includes details of local clubs, shows and events, publications.
   http://www.bpgs.org.uk/

Chiswick Horticultural Society
   A member-run society for garden and allotment enthusiasts in Chiswick, which organises flower shows, visits and social events. The society has a trading hut where plants and supplies are sold at discounted prices.
   http://www.chsw4.org

Community Composting Network
   Provides advice and support to community composting projects across the UK
   http://www.communitycompost.org/

Gardeners Club
   A directory of all local and national gardening related clubs, societies and organisations in the UK.
   http://www.gardenersclub.co.uk/societiesinfo.asp

Hampshire Clubs, Societies & Associations
   list of gardening groups supported by Hampshire County Council
   http://www.hants.gov.uk/istcclr/ifbcx233.html

Japanese Garden Society
   Seeks to bring together those who are interested in Japanese-style gardens. Includes society history, upcoming events, and membership information.
   http://www.jgs.org.uk/

Nantwich Flower Club
   Photo album, event listing and other member information from flower-arranging club.
   http://www.nfc.org.uk/

National Allotment & Leisure Garden Society
   NSALG is a UK nonprofit group aiming to minimise the loss of gardens for individual use.
   http://www.nsalg.org.uk/

National Association of Flower Arranging Societies
   Teaching charity with around 1,500 flower clubs affiliated to 21 UK areas and 100,000 individual members offers listing of courses, events and publications.
   http://www.nafas.org.uk/

National Trust for Scotland
   Guardian of Scotland's historic, architectural and natural heritage.
   http://www.nts.org.uk/

National Vegetable Society (UK)
   A contact point for all vegetable gardeners and allotment holders in the United Kingdom, who have an interest in competitions or shows. Information on membership, organisation and activities.
   http://www.nvsuk.org.uk/

National Vegetable Society Northern Branch
   Comprised of local vegetable growing associations in northern England; information about local groups, vegetable growing advice, horticultural shows, activities, membership and contact details.
   http://www.nvs-uk.org.uk/

Permaculture Association
   Supports people and projects through training, networking and research, using the ethics and principles of 'permanent agriculture'.
   http://www.permaculture.org.uk/

Slinfold Horticultural Society
   Promoting the knowledge, skill and practice of gardening, horticulture and floral art in Slinfold, Horsham, West Sussex.
   http://www.slinfoldhortisoc.co.uk

The Avon Gardens Trust
   An educational charity that aims to preserve, enhance and re-create for the enjoyment and education of the public parks and gardens in the former county of Avon.
   http://website.lineone.net/~avongardenstrust/

The National Trust
   Portfolio includes a number of historic gardens and landscapes, in England, Wales and Northern Ireland. Includes visitor detail on most of these, and websites for the principal gardens.
   http://www.nationaltrust.org.uk/

The North of England Horticultural Society
   Information about the shows and exhibitions organised by the Harrogate-based society.
   http://www.flowershow.org.uk/index.php?page=8

The Royal Horticultural Society
   Aims to encourage the science, art and practice of horticulture; site provides information about its shows, an online shop, an interactive plant finder, a guide to gardens and activities around the country.
   http://www.rhs.org.uk/