VP, whose blog I have just found (http://vegplotting.blogspot.com/2007/02/dinner-time.html), suggested naming garden-related guests for a dinner party. I'm going to name 5, because I'm feeling gregarious...
1. Graham Stuart Thomas. I've been told he was as nice in person as he seems in his books. His taste and ideas have influenced me enormously, and Mottisfont Abbey is my favourite garden other than our own. He seems to show a fine nature towards many things, as well as plants.
2. My distant relative Deirdre, who is so self-effacing about gardens but knows so much. She would be great company socially too.
3 and 4 -bit of a gamble: my two grandmothers, who met only very briefly. I never met my maternal one. Both were very keen gardeners, unlike my parents, and I would love to talk to them about it.
5. Harold Nicolson. I'm a little sccared that I might not actually like Vita in person, but HN would be interesting for all sorts of reasons :)