Here are a few photos showing it's progression. It started out as a flat white end piece with absolutely no green, and no raised parts. It was half frozen and I didn't think it would work, but it surprised me.
|Regrown celery from cut end, regrowing!|
|Regrown celery from cut end, growing big enough to need transplanting|
|Transplanted regrown celery...looking like celery now.|
|Regrown celery regrowing nicely.|