I was at a local nursery last week and I asked the owner why he only used greek names, and not the scientific ones, and I also asked for some labelling instructions. He is very knowledgeable (a university degree in both horticulture and landscape architecture), but he said that none of his customers would understand anything else. He did say, though, that he was planning to set up signs with links to internet databases and allowing customers to use his internet (when he has time...), one can always hope.