Winter onions, Tree Onions, Walking onions, Egyptian  onions , easy to plant,  just trough  on the garden , and water once a week.In winter you can planting in a pot near to the window. 

Outside In winter the onions are under ground and start to regrow in spring.  In summer is good to water if there are not raining.  I am not good for planting anything,  so I know the best for the ones loves onions cultivate this walking onions is a good experience.

When we bought a house from a nice couple , he was 100 years old and his wife 97, (in a really good shape) .First I saw  the onions at backyard.I said "a lot onions there"....he just smile and replied "we love winter onions" it grow and grow..but 2 months later, december, winter, means snow...and no onions...I was wondering  if he had taken 🤔 the onions?...and when start april...bualaaaa onions coming again..now I know the name walking onions..because spread around...but if you don't want spread..just take the seeds top when it grow and you can eat it too.  

You can see this link below about this onions

https://en.m.wikipedia.org/wiki/Tree_onion