Hello....I am brand new to this forum, although I have had a goldfish pond for 2.5 years, but am still learning. Our pond is outside, about 900 gallons, kidney shaped and about 2 feet at the deep end and 1 foot at the shallow end. This is the first year we planted a water celery plant and it has grown HUGE and overtaken much more of the surface area than I anticipated. I have pruned it, but not too much so that the roots couldn't do their biological cleaning. As I've never had water celery before, I thought it was too tender to leave overwinter. Does water celery, if pruned and placed at the deepest part of the pond over winter, come back in the spring, as my hardy water lilies and irises? We are at 5,700 feet above sea level in Albuquerque and get plenty of freezing in winter. The fish do well. Thanks
My water celery has overwintered itself in a waterfall and in the ground. The runners will jump on to land and grow there as well. Also, if it flowers, it will self-seed for next year. Water celery is very hardy in my experience so you shouldn't need to lower a pot of it. Unless you have ruminates (like the white tailed deer here) that keep eating your water celery, it's not going anywhere. You can certainly lower a pot if you want to do so but it may not be necessary.