Early this summer I mixed 1 oz. of 51% glyphosate to one gal. of water with dishwashing surfactant for spraying an experimental 15 x 20 foot section of cattails. The cattails only bent over slightly but nothing happened. A month later I mixed 4 oz. of glyphosate to one gal. of water but without and surfactant and again sprayed. The cattails slowly started to die but a few stayed mostly green, and I figured that was because I didn't have the surfactant to completely wet them. But later on even the partially green ones died also and the area is now completely dead. So far no cattail have grown back. I supposed the real test will be next spring to see if they come back in the sprayed area.
I took this picture early this morning since I didn't have any taken in sunlight.
