In the garden: Begonias at the Coastal Maine Botanical Gardens
The photograph isn't really showing the scale here; these are more begonia bushes than begonia plants. I had no idea that begonias could get so large!
So perhaps in the same way that I have framed one path with roses on either side, I could frame another with begonias. Wikipedia tells me there are begonias hardy in Zone 6. It seems that companion plants for begonias are conceptualized in terms of color combinations, and not the health of the plants, which is a shame. It seems they like some shade, but the area I have in mind is full sun....
Anyhow, since it's Friday night: