By Phillips, Roger, Rix, Martyn
By Chan, Peter
By Jon Ardle
By Adams, Peter D.
By Lewis, Colin
By Hobson, India, Edmondson, Magnus
By Nigel Dunnett, Noel Kingsbury
By Fish, Margery
By Rickards, Martin
By Lloyd, Christopher
By Klein, Carol, Buckley, Jonathan
By Shaw, Christine
By Berry, Susan, Bradley, Steve
By Kirsty Wilson, Hazel France
By Paul Whittaker
By Adrian Slack
By Peter D. Adams
By Carol Klein, Jonathan Buckley
By Stephen Lacey, Andrew Lawson
By Pam Baggett
By Charles Quest-Ritson
By Will Giles
By Rachel De Thame
By Dan Barton
By Rittershausen, Brian, Rittershausen, Sara
By Robert Geneve (University of Kentucky, USA), John Preece (University of California, Scott Merkle (University of Georgia
By Diana Grenfell
By Hessayon, D. G., Dr D G
By The National Garden Scheme (NGS)