That bunch of celery you bought at the grocery store? It might turn into an eternal supply of celery if you have any gardening luck at all. Sheryl at Chickens in the Road cuts off the bottom end of the whole bunch and plants it. The roots and stalks start regrowing immediately!
It will grow a brand new top to be cut and used. After re-growing celery, you can cut and plant the bottom again for more new growth from the top.
I plan to start planting my cut celery bottoms in small pots or trays late next winter so that I have a few dozen to plant out into the vegetable garden in May. I wonder if I can grow it in a sunny window all winter!