Ornithogalum umbelatum. A rampant spreader.

Thanks for the quick ID! After reading up, will enjoy the current flowers and dispose of before seed set.

If only seed were the problem with this one...its primary reproduction is bulblets and it's difficult to get rid of all of them.

.... primary reproduction is bulblets and it's difficult to get rid of all of them.

Yes, a valuable warning based on the few sources I checked after learning what it was. I was not clear that "dispose of" meant the entire plant, bulbs and all.... and not in the compost bin.

Take a good chunk of soil with it as well to capture as many of the bulblets as possible. Some will still appear next spring.

Fortunately they've never left the 4" pot I planted them in, so am sure to get them all. Luck rather than wisdom, but something I will remember when collecting other unknowns.