Star of Bethlehem. It will multiply like mad, you won't get flowers, just grassy stems that look a mess and be almost impossible to dig out. I inherited them with the garden 20 years ago and am still trying to dig them out.
@FlyDragon, I agree with @didyw, but with a slight addition. These are really odd flowers that, once they've multiplied, push up messy grassy stems that sit for what seems like weeks and weeks, before suddenly they flower. The flowers are really pretty but seem only to open in the sun, and close up again at all other times. They will multiply like mad, so it is worth digging them up each year and either moving, giving away or binning the excess bulblets. This will keep them looking less straggly.
They are impossible to kill btw. I dug up a load and shoved them into a seed tray with a bit of soil about two years ago. In spite of being ultra dry most of the time, and being out in the elements, they are sprouting again right now and I'm thinking I should put them around the garden under a few shrubs where they will look better than the weeds that are growing there right now.
They are very much one of those plants where just a few are quite nice, but nature being what it is, you will never just have a few!
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Petals have green on outside.
https://www.google.com/search?q=Ornithogalum+umbellatum+macro&tbm=isch&ved=2ahUKEwjzs__2z7_wAhVD0RoKHaVbBWcQ2-cCegQIABAA&oq=Ornithogalum+umbellatum+macro&gs_lcp=CgNpbWcQDDoCCAA6BAgAEB46BAgAEBhQg6oBWPzAAWDg0gFoAHAAeACAAewCiAH1BpIBBzIuMy4wLjGYAQCgAQGqAQtnd3Mtd2l6LWltZ8ABAQ&sclient=img&ei=Y2uZYLP2IcOia6W3lbgG&bih=579&biw=1280&client=firefox-b-d
Not sure where they've appeared from, none before and now a patch of them in one of my raised beds, but they are quite pretty.
They will multiply like mad, so it is worth digging them up each year and either moving, giving away or binning the excess bulblets. This will keep them looking less straggly.
They are impossible to kill btw. I dug up a load and shoved them into a seed tray with a bit of soil about two years ago. In spite of being ultra dry most of the time, and being out in the elements, they are sprouting again right now and I'm thinking I should put them around the garden under a few shrubs where they will look better than the weeds that are growing there right now.
They are very much one of those plants where just a few are quite nice, but nature being what it is, you will never just have a few!