I am in the process of moving my tender pond plants into the sunroom. I am clipping off dead parts and excess growth so that the plants will fit into a small indoor tub. I am discarding the excess water celery and now have an itchy rash on my hands. Has anyone else experienced this reaction? I have looked online to see if this is a possible allergic reaction but can't find anything. It has never bothered me before. I will be more careful as I finish up. Also If you are interested in any water celery I have plenty and it will over winter potted up sitting in a saucer of water.