I seen once on Facebook someone gardening using tubs and round barrels. It looked like something I would enjoy doing.
Do You Have Ideas Using Barrels and Tubs?
You can use any kind of barrel or tub, as long as it has some drainage, and did not contain a poisonous material. This article will help you get started with container garden: https://www.gardeningknowhow.com/special/containers/novice-container-gardening-tips.htm