When you buy green onions/shallot from the grocery store they still have the roots intact. Use all the onion you need and leave about an inch above the roots.
To regrow green onions, place the green onion in a container with a little bit of water (enough to cover the roots) and change out the water every day.
You will be amazed at how quickly they grow back!! By the next morning you will be able to see the new leaves shooting up already. I plan to put a lot in my garden this year. I will just snip off the portion I need and leave the bottom in the soil to grow away and make me a new one!
This is such a great frugal tip. It will save you money on produce as well as on your garden. They are cheaper to buy from the grocery store than as seeds and they are already strong and healthy plants! I spent the extra couple cents and got the organic ones because I will be putting them in my garden.
I hope you enjoy this tip! If there are any other interesting tips like this you know, please feel free to post!