Allium tuberosum or Garlic Chives are grown as a vegetable throughout Asia, particularly India, where the leaves are used for flavouring.
It is a bulbous herbaceous perennial with narrow strap like leaves and umbels of white star-shaped flowers at the tip of angled flowering stems in mid to late summer.
You can harvest leaves at any time in the growing season and more will grow to replace.
For many ( in Asia) its a valuable harvest as you go herb, but others (in North America and Europe) like it as a border plant, providing contrast and interest within a mixed border.
Although grown largely in the tropics, this is a frost hardy plant.
In cooler climates the foliage will die back in winter to re-sprout again in spring.