I think the plants used most often at the New England Flower Show were bamboo, feverfew and rhododendrons.
I was really glad to see this:
Nicotiana sylvestris, used as a specimen planting! None of my friends are gardeners, I haven't ever really known a gardener. I have never seen this plant in real life, before, but I am growing it with the Carmencita Castor Bean. I cannot wait to see them together!