Forums DIY Controlling pond blanket weed? Reply To: Controlling pond blanket weed?
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You can reduce light with water lilies and the like. Our pond, which gets a fair bit of sun as ponds should, is covered in duckweed too which, although a pain, does do a good job of keeping the light levels down and can easily be skimmed off with a net, or hands, to control it.

We have lots of oxygenating plants too and the water has remained clear and free of blanket weed year on year. No fish though.