The Pond Guy has a very good and quick weed ID service.....no obligation to buy any herbicides from them but they will tell you if it is invasive and if it is how to kill it. Send a decent picture off your smartphone and they will be back to you in 24 hours or less.
[email protected]I have used it multiple times. Very helpful. BM61
BM61,
I sent the e-mail to Pond Guy as you suggested. Their reply, "This weed looks just like a shoreline grass...." So, at least in their opinion, it's not cattails.
As it seems easily controlled by a pond safe glyphosate, I think I will keep a small area as another type of habitat when the water level goes back up.
Pat,
Must be at least similar to what you neighbor has so it will be interesting to see if it forms any kind of flower or seed head.