A while back, I talked about the kinds of cool things you can regrow from the veggies you get at the grocery store.
Here's the link to the original list of stuff you can grow from your kitchen scraps.
I've had great success growing leeks this way. Eeeeaasy. They come screaming out of the ground.
We decided to try some celery, too.
I don't like celery much by itself, but I like it in soup stock. We buy a few bunches every year, then cut them up into little chunks and dehydrate them. Then they go in bags in the freezer so we can grab a handful at a time to toss into soup stock. Mmm.This time, I cut the bottoms off and popped them into a bucket with a little water. Instant new growth.
I had three and cut them at 1", 1 1/2" and 2". The 2" one was happiest and put out new grown the very next day. The middle one took a few more days. The 1" took its time, but did eventually put out some new growth.
My recommendation: Cut off at least 2-3 inches from the bottom of the celery bunch if you're planning on re-growing it. As soon as you see green and/or roots, pop it in some soil.
Just as easy as the leeks!