definitely water celery. you can see how it grows over the summer here
http://puregold.aquaria.net/mypond/2003/8-2003B.htm
Ingrid

"Jim and Phyllis Hurley" wrote:
You might get some watercress from the store. It grows easily.

In the summer, it dies back in the heat. You might think about water
celery, it thrives in the summer. Additionaly, water hyacinth. Both grow
well and produce lots of discardable plants...throwing out as green plants
what was brown waste. The root systems catch muck and provide great
bactrial surface.


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