I had a neighbour at hummingbird that grew these onions. He said the ones he grew were actually the green onions he bought at superstore or any grocery store and just replanted and allowed to mature.
I wonder if they are bunching onions? You can buy seed for them but they are best planted in the fall. They become quite tall and lovely like the ones you see at the garden.
I have grown Egyptian walking onions for years and, as they are perennial, have enjoyed them early in the season each year. We have been eating the tops for almost a month now. If you would like a starter set and some bunching onion seeDs , please email me.
