Regrowing vegetables

I've been seeing things online (thank you Pinterest!) about how you can regrow some veggies after cutting the tops off and using the roots just by placing them in a bowl of water and eventually, planting them.  So, I decided to give it a try! I tried green onions first and they grew in less than a week!  Whenever I needed a green onion to cook with I just cut from my regrown plant, how cool is that? :). 

I'm now trying celery and lettuce to see what kind of results I'll get.  Here are some pictures of my experiments!

The green onions 

Here is the lettuce, celery and green onions.  the onions are growing again after I cut them all the way down for a second time!