These delicate white flowers that grow in our garden are edible garlic chives or Chinese chives [Allium tuberosum [Latin], gau choy 韭菜 [Chinese] and nira [Japanese].
I remember seeing them in abundance in outdoor vegetable markets in Asia.
The stems are a great flavour enhancer and the white flowers are perfect to finish off a salad. If you do not like the idea of flowers in your food, break them up into petals.
This plant can be cultivated very easily, even in window boxes, and they need a lot of direct light.
Flowering chives are a good source of Vitamin K, Magnesium, Calcium, Folate and Potassium