What are these white flowers? They grow from a large bulb and close during the night.

MILLERSTOWN, PENNSYLVANIA Wendy Gelnett

Melinda: This dainty spring bloomer is a star of Bethlehem (Ornithogalum umbellatum). It rapidly spreads through gardens into nearby lawns and, in some cases, natural areas. Digging the large bulbs is tedious, but it’s the most effective way of managing the spread of this plant.