In NSW and the ACT shallots refer to an immature onion picked before the bulb has started to form. Sold in bunches they have white bottoms extending up to green tops. Confusingly what are called shallots in NSW are called spring onions in some other states. And what are called eschallots in NSW are called shallots in some other states. They are a really a more immature form of what is called a spring onion in NSW. The whole of the shallot can be used but many recipes specify for the bottom section only. Shallots are used in Asian cooking and are good raw including in salads.
All year round.