Kew Gardens - http://www.kew.org/visitor/visitkew.html

Soil Association - http://www.soilassociation.org/

Garden Organic - http://www.gardenorganic.org.uk/

Royal Horticultural Society - http://www.rhs.org.uk

Kedar Greenhouses - http://www.kedargreenhouses.co.uk

Looking for gardens to visit ? - http://www.gardenseeker.com

Hampton Court Palace Flower Show - http://www.rhs.org.uk/hamptoncourt/2008/index.asp

Chelsea Flower Show - http://www.rhs.org.uk/chelsea/2008/index.asp