Allium proliferum
 
You'll receive 10 plants.
 
Also called Walking Onion. A cross between a standard and a Welsh onion.
 
Cold hardy to zone 3. Perennial allium that is both edible and attractive.
 
Tasty cooked like green onions or used fresh in salads, thinly sliced. Dies down in areas with colder winter temperatures, then comes back in the spring. 
 
Plants give you a headstart if you want to speed up the process. You can collect bulbils from mature plants in the future to expand your patch.