Over run with Duckweed.
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Yes. But I wouldn't use any for a garden pond especially if you have fish. Keyword 'Duckweed control' or 'Lemna' control. I agree with @GBBUDD, use fish. Goldfish will devour the stuff. There are all sorts of ways to deal with it depending on your pond's size and other factors. How many gallons is your pond? Do you have fish?
Yes. But I wouldn't use any for a garden pond especially if you have fish. Keyword 'Duckweed control' or 'Lemna' control. I agree with @GBBUDD, use fish. Goldfish will devour the stuff. There are all sorts of ways to deal with it depending on your pond's size and other factors. How many gallons is your pond? Do you have fish?
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Especially if your pond is small, it'll take you a whole 5 minutes to net it all out. Easy peasy. Had a 1000 gallon pool for overwintering and it was completely covered with duckweed by the time spring came (damn turtles; don't they know it's there for THEM??). Netted it out, threw it into the pond outside, in 3 days, it was completely gone. Wouldn't have taken THAT long if I'd done it in summer...
j.w
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I just took a bunch of duckweed out of my fish free little wildlife pond yesterday. I just used a long bamboo stick and stuck it in the duckweed and wound the stick around it and pulled it out and took it to my big pond w/fish and they will suck it up in no time till every morsel is gone. I have goldfish only. Wonder why your fish don't eat it up? Anyways if you just keep pulling it out eventually you will either have it all gone or under control as long as you keep on top of it.
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j.w
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All organized by category and then some! I can easily find what I want in other words
I agree that skimming out any extra Duckweed (Lemna spp.) is the way to go. However it will likely decrease on its own anyway as Fall gives way to Winter.
If you do skim it out, use it as mulch or compost in your garden beds.
If you do skim it out, use it as mulch or compost in your garden beds.
j.w
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Or have it in your salad 
It's crazy while my buddies and I stopped for a bite we sat at the. Bar when I got the most bizarre request ever. This well I belive he cled himself a guy came up to me and asked if he could get his girl friend in my bar stool so he could take a pic of her with this horrible plaster bust of Elvis it realy was that bad. And here you are with creepy Elvis number 2 in one day.. worst part is neither beat the fool that asked me to be in the pic with his gf .
Thanks to all who replied. It is only a small pond with a few Goldfish/Rudd and of varying sizes. I also have plants including Lillies which mean it is almost impossible to scoop out the Duckweed which gets amongst the leaves. If left a couple of days it seems to spread rapidly. I know you can buy a chemical additive for the Duckweed problem but don't know if it works.
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if you take a rake in one hand and pull the lily leaves out of your way, then take the net in your other hand and get the duckweed. Not that hard. There's not going to be a chem that affects the duckweed and DOESN'T the lilies...