PS I forgot to mention that all of the plants I've mentioned- and many more- are listed in the Plants Database (look at the top of your screen, above the NGA logo) with photos and growing info, so if you're curious about a plant, that's a good place to look for info.
For example, have a look at this plant record, admire the plant photos, then scroll down for garden photos that feature the plant in gardens:
Japanese Forest Grass (Hakonechloa macra 'Aureola')
Virginia
