Q.What is ornithogalum flowering time? What care does it need? Why is my plant becoming yellow?
My ornithogalum plants are becoming yellow.

Certified GKH Gardening Expert
The articles linked below will give you all the information you need on how to care for your plant, whether it is the Star of Bethlehem or the Orange strain. Regardless, the Ornithogalum comes from a bulb so, after blooming, the foliage will die back naturally on its own and fresh shoots will reappear.
Please read: https://www.gardeningknowhow.com/ornamental/bulbs/star-of-bethlehem/star-of-bethlehem-plant-care.htm
https://www.gardeningknowhow.com/ornamental/bulbs/orange-star/growing-orange-star-plants.htm