The pot was in my pond water. I took it out for division. I'll grow a lot more
when I get a big barrel, for pond water filtering and personal consumption.

Btw, those plants look good now, but terrible for eating. You need a special
cultivation technique to tender them for human consumption.

wrote:

I think it looks like water celery. It's a great plant for veggie filters,
my pond's filters are filled with this plant.
Bonnie