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Hi all.

        These started appearing in my 8ftx4ft 20 year old pond last year, they float and have a 2cm root as thin as a human hair. They cover the entire surface of he pond. I scoop most of them out with a small fishing net, and before I know it the pond is covered again. The plant in the pond have been there for over 15 years. Where on earth do they come from and how do they spread. It is as though someone is sprinkling them over the pond that spread so fast. The big question - How do I get rid of them.

The picture is of the waterfall header.




It's duckweed, scoop it off with a net

Can I not get rid of it


Duckweed - nigh on impossible to get rid of them - they come in on the legs of birds and the skins of frogs - neighbour's pond  is totally covered with it - it was only a matter of time before it arrived in our new pond and we noticed it last week - all you can do is skim as much as you can off every so often.  It reproduces rapidly.  It does no harm and provides ponds with much needed shade at this time of year. 

The pond has no fish but plenty of frogs. Well at least I know where it comes from, I was hoping it was a plant I could get rid of.

Thanks for the information.



I have duckweed on both my wildlife and fish ponds.

It stays under control on the fish pond but I am forever taking it out of the wildlife pond!

The pump packed in a few years ago. How about if I scoop all the duckweed out I can,  buy a new pump, raise it so the filter is just below the surface and run it frequently. Would this suck duckweed out before it has the chance to grow. Is this what keeps yours under control in your fish pond madpengiun.

Dovefromabove's right Winger. Here's a photo of my pond


 This was taken in early May but looks about the same now. I have a forest of oxygenators underneath so duckweed sits on top. I draw most of the weed towards one corner, it 'piles up' and dies off, then I take it out.

There are always bits floating about but I find that blanket weed grows just under the surface which is the real menace, so that gets taken out too. Have put logs of barley straw in, they sink to the bottom and do help to keep the blsnket weed down.

Have a small pump but it doesn't draw out the duckweed. 

Pond life is flourishing, have pond skaters, water boatmen, beetles, snails, frogs, even saw tadpoles yesterday. Mayflies hover, birds bathe on stones, waterlilies looking healthy.

Will post another photo, time there was a more recent one 

Taken this morning, facing east so lots of reflections



Blackbird just had his morning dip on the stones, water everywhere! 


fill the pond to overflowing, it'll then float away and can be left to rot down where you can.


I don't have any pumps or filters in either of my ponds.I think it is just the goldfish eating the weed that keeps it under control.

Thanks for all the info and replies, pond life does flourish in my pond, I keep a bird bath and the waterfall header topped up since the pump packed in, I rarely see a bird on the birdbath, but there is often a bird on the stones in the waterfall header. I put the stones there for that very reason, and am happy enough to wash the duckweed down into the pond.

I am thinking of something like a hose with a sort of pump impeller in the middle, where I can have one end in a bucket filter over the waterfall header, and use the other end to sort of vacuum out the duckweed.

If I laid down a toe pool like they have at swimming baths, do you reckon the frogs and birds would use it before they go near the pond


If you explain it nicely to them I'm sure they will - why didn't I think of that? 


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