Regrowing a carrot top is an easy and fun introduction to the way plants grow! One thing to be aware of is that you will not get another carrot (the edible root of the carrot plant) from growing it this way, which is important to tell the kids to avoid disappointment. Theoretically, if you grow the plant long enough, you might be able to get seeds that you could then plant and would turn into carrots, but it would take a while!