I have been growing chives for about 15 years and they are all from the same one plant I bought so long ago.
Here they survive all winter in the ground or a pot but I whack them back once a year in the winter. I rarely if ever buy green onions and just use fresh chives instead in recipes. You can use them by themselves or chopped up with a little minced onion. They divide easily and if you live in a cold region I am sure you could over winter them in a pot set in a sunny window.
They require just some water. I never feed them and they just keep going and growing. This year I have divided ones potted up away for Mother's day gifts.
Remember to join me tomorrow for Sunny Simple Sundays.