My mom discovered the infinite celery hack and does this to all the celery we buy!
Seriously it’s super easy, you cut the celery off the base (leaving 3 inches or so) and put it in a little bowl with water. Give it fresh water every other day, and don’t fill the bowl all the way! After that, just wait and it will start to grow from there :)
We planted one recently and it’s not doing too well, but I think it’s just dealing with not having as much water as often.