I can't remember if this is something I planted, or it just popped up somehow. Hope someone will be able to ID it.
It has very fine leaves, looks like an allium of some kind. The other leaves in the photo is a Japanese anemone and a flag iris at the right corner.
Overview
closeup of blooms
The leaves are very dense and it is crowding out my other plants, so I have not yet decided whether to continue to let it grow in the future. It does not smell oniony.
