We bought a house a couple years ago with a 1/2 acre pond. There are yellow iris around about half of it. They are taking over. They are only pretty for about a week in the spring and the rest of the time they are really tall and block the view of the pond from the house as well as acting like a leaf catcher making more stuff fall in the pond. I have tried digging them out with a shovel. No way. The roots are all over the rocks that we have around the pond so when you dig you hit rock. I want to get rid of at least some of it. There are some of the plants that are a good 3 feet in diameter. What can I put on them to kill them without harming the fish? They are totally out of control. Thanks. Vicky