Judging by the company this vine with tiny white flowered inflorescences is keeping, I decided to search for invasives (as that seems to be the theme of this planter with blackberries and ivy, but maybe it's supposed to be a honeybee planting). Sure enough, I found photos of Reynoutria japonica that have the same little samaras. Is that what this is? Some of the google images filed with this name matched this exactly, but most seemed a little different from this. And for extra credit, are they samaras? The third photo shows what seems more like a bud arrangement, but in the last photo, they look like the seeds. I didn't realize they were different when I was looking at them. It won't be the first time I've mixed up buds and fruits.