Hi folks,
I don't want to step on anyone's toes so please don't take offense at my comments. I welcome dialog if you agree or disagree with me on any of this. E-mail or public discussion is fine.
Cattails are considered to be invasive in most plant data bases. There are 2 types commonly found in the higher latitudes of the US. The narrow cattail, Typha angustifolia L. is considered to be an introduced, invasive species according to the USDA. The native variety Typhus latifolia L. is being hybridized with the invasive species to the point that there are few pure stands left. This could be by some states (NY) want to protect them. You might want to check with your county Extension Office to see if they know for sure what is in your area.
So having said that, none of the 3 Typha (cattail) species found in the US are viable fodder for any wildlife. If anyone on these forums can help document any waterfowl actually eating these plants, would you let me know. I suspect that when it looks like a duck (drake or other) is eating the cattail, I would guess that they are simply harvesting insects found on the plants.
Cattails are a big problem here around the Great Lakes. We've been studying them and Phragmites for several years and have not come up with a decent control method. If anyone has verifiable evidence that we can use ducks as a control method, please let me know. I know several professors, biologists and DNR personnel that would appreciate the help.
What we (I) know for certain at this time is that the only sure-fire way to control cattails is to burn off the top growth and manually dig out ALL of the root system. It's hard work!
Randy