Interesting, I didn't know you could look at older Google Maps photos. I'm curious, what color of bark do young horsechestnuts have, and does it match the bark in the (sadly blurry) old Google Maps photos? And do Rogersia shoots have lenticels? The sprout that we're trying to identify had lenticels in a previous photo (
http://garden.org/pics/2016-05...). I think lenticels only appear on woody plants. If that's true, the plant couldn't be Rogersia, which is herbaceous.
