All I can say is Wow!

I've been waging war with it in my stream, but I've never seen it multiply THAT fast! Your stuff looks like its on steroids, LOL!

I'm considering getting rid of all my pennywort also. Too hard to stay on top of to keep it thinned.

I pulled out what little I had last summer, but must have left a bit of root somewhere. This summer I had a little bit of it pop up. So here in Oklahoma,Zone 7, it must be hardy. Hope I don't have a population explosion like that, although its roots do help clear up the water.

Oh my!! Good information to have! Sure is true that a picture is worth a thousand words :)

A quick google shows that depending on the variety they can be hardy up to zone 5 and are considered a nuisance in the warmer climates. I hope yours isn't.

Bet the fish were glad you got home to save them from the beast!

I have giant pennywort and it's not that bad here in Alabama.

Awesome! That is what a few pounds of fish food each day will do for your plants......thanks to your neighbor. lol But seriously that really is awesome albeit a lot of work. I hope I can get some of your pennywort for next year. Could just put it in the settling pond. It does look beautiful.