Wild celery? Seems pretty tame to me. It turns out that it has now gone wild all around the world. It probably started out in the Mediterranean area. It requires damp open ground that is just a little salty, so it doesn't spread too easily. It was once farmed in a fen south of town. After the farming was discontinued, white lady-slippers popped up. That area is now choked with invasive buckthorn. Celery would be better. It's now been reported from AZ, CA, CT, FL, ID, IL, LA, MA, MO, MS, NC, NJ, NM, NV, NY, OH, OK, OR, PA, SC, SD, TN, TX, UT, WA, WV, and NS. Beal Gardens, MSU, 6/24/11.