These white flowers are around 2cm in diameter. There is a lot of this growing on Upper Asian Way around the Prunus sargentii. I don't remember if the flowers were more dense than this, or if the plant looks like this over a long blooming time. Name?
Hmm. Thank you. I did come up Lunaria last night, but the search mostly returned L. annua, which was unconvincing. I checked Garden Explorer and L. rediviva is not supposed to be in that location but is in the north garden. Those photos look pretty similar. I'm eager to see the seed pods.