I killed cattails that I had in the pond by spraying them with a pond approved type of "round-up" that had extra surficants in it. I had to hit the cattails 3x or 4x during the year (anytime I saw green), and then when the pond froze over I burned the dead stalks that were above the ice (I burned it on a low wind day and there was snow on the ground).

I had to hit them 2x the next year (anytime I saw green shoots trying to sprout up) but that did the trick.

I've got cattails trying to sprout in the pond now, and keep pulling immature plants when they're a foot tall or so. The nearest cattails are in a ditch about 1/2 mile away. The seeds are like milkweed seeds - they fly everywhere.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).