Curly Leaf pond weed is really a curious plant. Last year was the first time I had this plant and I had read how it comes on fast in the spring and then dies back for some reason. This year it looked like it was going to take over the pond and so I put in 6 GC a month ago. Not enough time for them to control it, but then it died back or whatever it does by 3/4% it seems. I like this plant for my minnows as it has an airy loose look in the water that the minnows freely swim through, adds to the oxygen in the water and so far has contributed to the no growth of FA,,,, so far.