Is celery a stem or leaves?

My friend and I were having an argument about this. Which is true? I said celery is just a bunch of leaves from the celery stem and he claims celery stalks are just stems. I tried looking up some info on it but couldn't find anything definite. How could I prove that celery is leaves by using info about the... show more My friend and I were having an argument about this. Which is true? I said celery is just a bunch of leaves from the celery stem and he claims celery stalks are just stems.

I tried looking up some info on it but couldn't find anything definite. How could I prove that celery is leaves by using info about the structure and function of stems vs leaves?
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