If you have grass in your plants in your pond, JW, just try pulling them from the middle of the plant. I found I had some grass that I got when I dug up some wild reed in the creek near my home. I pulled it form the middle, and it came up root and all. This time of year it's not as hard to pull out, but if you wait another month, the roots will have grown deep, and then you are "SOL".
I have Sweet Flag, it must be dwarf. I have had it 3 years now, or this is the 3rd year, and it has not grown at all! I have never crushed it between my fingers, so will do that! Maybe that will give me some satisfaction for it. It's a pretty yellow and green varigated, but just won't grow. have it in the bog, about 1" of water, down in the pea gravel. Wonder if it needs more fertilizer or something.
Got a cute find this past weekend, must take pics of it, now that my camera will turn on (just won't zoom, darn it). It is a "mini" cattail, and has just that, 1" cattails, although it looks more like a reed (round stems) rather an cattails flat stems. Hoping it will multiply so I can share it. Supposed to be hardy for my area, probably up to 5 or so.
EH, your pond is unbelievable! Wow, it looks like it goes around the corner, under that little bridge. Wow, I'd love to see an aerial of your yard, so see how it's situated, Love the waterfall, the way it separates around the rocks at the bottom, what a neat idea. And your plants are gorgeous as well. Thanks for sharing the photos.