Very many thanks, Maggi and Arnold T. I'm visiting New York with my daughter for a short 4 day trip so will only be able to take in one good garden (trade off with my daughter - I'll go to the shops with her). Thanks, Arnold, for pointing me in the direction of the New York Botanic Garden for it looks really interesting, especially the Native Plants area. I'll try to post a few photos when I get home - but not until after Gardening Scotland.